# JNU ECOM 2011 QUES 67-78 Classic List Threaded 27 messages 12
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## JNU ECOM 2011 QUES 67-78

 QUES 67 If log10(x-y) = 3 and log10(x+y) = 4, ( 10 is the base of the logarithm !!), then x= a) 3.5 b) 11000 c) 5500 d) 103.5 Answer-cQUES 68 The real solution(s) to the equation |x-1|=2x+1 is/are: a)-2 b) -2,0 c) -1 d) 0 Answer-dQUES 69 Four dice are thrown. What is the probability that the same number appears on each of them? a) 1/36 b) 1/18 c) 1/216 d) None of the above Answer-cQUES 70 Answer-aQUES 71 The mean of a data set is equal to 10 and its standard deviation is equal to 1. If we add 5 to each data value, then the mean and standard deviation become: a)mean= 15, standard deviation=6 b)mean= 10, standard deviation=6 c)mean= 15, standard deviation=1 d)mean= 10, standard deviation=1 Answer-cQUES 72 The sum summation k from 1 to 100 (3+k) = a)5053 b)5050 c)300 d)5350 Answer-dQUES 73 How many 4-digit numbers can be formed, if no digit is used more than once? a)5040 b)3024 c)4536 d)None of the above Answer-cQUES 74 Answer-bQuestion nos. 75-78 are to be answered on the basis of following: The following table shows the marginal cost of producing nth ( n=1,2,...10) unit of output by a competitive firm: It is also given that the total cost of producing 3 units of output is 7. QUES 75 The total cost of producing 5 units of output ( correct up to two decimal places ) is: a) 15.00 b) 9.30 c) 12.30 d) None of the above Answer-cQUES 76 The average variable cost of producing 7 units of output ( correct up to two decimal places) is: a) 2.60 b) 0.71 c) 3.03 d) None of the above Answer-aQUES 77 The average cost of producing 9 units of output ( correct up to two decimal places) is: a) 3.66 b) 3.99 c) 0.91 d) None of the above Answer-bQUES 78 The profit-maximizing number of units of output for the firm, if the market price of the good is 6, is: a)4 b)7 c)10 d)None of the above Answer-b
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## Re: JNU ECOM 2011 QUES 67-78

 Arushi, Please explain why you are not considering the colution x=-2? .. I thought the answer would be (b) -2 and 0.. Thanks a lot!
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## Re: JNU ECOM 2011 QUES 67-78

 Arey , If x = -2, LHS = |-2-1| = 3 RHS = 2(-2)+1 = -3 So, -2 cant be the solution. At x = 0, RHS = LHS = 1.
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## Re: JNU ECOM 2011 QUES 67-78

 Gotcha ..! Thanks :) ----- Reply message ----- From: "Arushi :) [via Discussion forum]" To: "Ridhika" <[hidden email]> Subject: JNU ECOM 2011 QUES 67-78 Date: Wed, Mar 26, 2014 7:25 PM Arey , If x = -2, LHS = |-2-1| = 3 RHS = 2(-2)+1 = -3 So, -2 cant be the solution. At x = 0, RHS = LHS = 1. If you reply to this email, your message will be added to the discussion below: http://discussion-forum.2150183.n2.nabble.com/JNU-ECOM-2011-QUES-67-78-tp7585519p7585558.html To unsubscribe from JNU ECOM 2011 QUES 67-78, click here. NAML
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## Re: JNU ECOM 2011 QUES 67-78

 In reply to this post by Arushi :)) Hey Arushi, Could you please tell me how'd you solved 75 to 78? My answers are not matching except for the 76th one. Isn't the TC colum will look like: Y  TC 1   1.0 2   2.3 3   4.0 4   6.3 5   9.3 6   13.2 7   18.2 8   24.7 9   32.9 10  42.9 Someone please help!
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## Re: JNU ECOM 2011 QUES 67-78

 Its given that total cost of producing 3 units is 7So given the MCs, OUTPUT , TOTAL COST, MARGINAL COST 0,3,0 1,4,1 2,5.3,1.3 3,7,1.7 4,9.3,2.3 5,12.30,3 6,16.2,3.9 7,21.2,5 8,27.7,6.5 9,35.9,8.2 10,45.9,10 75- total cost of producing 5 units is 12.30 76-for 7 units of output , total cost = 21.2     for 0 units , total cost = 3 = fixed cost     for 7 units variable cost = 21.2- 3= 18.2 => AVC = 18.2/7= 2.6 77- for 9 units , total cost = 35.9 and average cost would be 35.9/9= 3.99 78- If P = 6, then at MC = 5 , firm will produce 7 units .
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## Re: JNU ECOM 2011 QUES 67-78

 Thank you so much. Can you tell me from where should I practice macro questions? Which book?
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## Re: JNU ECOM 2011 QUES 67-78

 In reply to this post by Arushi :)) can someone answer me question Q72
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## Re: JNU ECOM 2011 QUES 67-78

 The sum summation k from 1 to 100 (3+k) = a)5053 b)5050 c)300 d)5350 This will be (3+1)+ (3+2)+ .... (3+100)                = 3x 100 + (1+2+3+...100) = 300 plus sum of first 100 natural numbers (sum of first n natural numbers = n(n+1)/2) = 300+5050 = 5350 which is d :)
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## Re: JNU ECOM 2011 QUES 67-78

 Thank you so much.
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## Re: JNU ECOM 2011 QUES 67-78

 In reply to this post by Arushi :)) My answer is not matching for ques 70..pls help MA Economics DSE 2014-16
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## Re: JNU ECOM 2011 QUES 67-78

 Let Y=-e^x-2 y+2=-e^x -(y+2)=e^x take log both side log(-y-2)=x y can take value (-infinity,-2) so option A
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## Re: JNU ECOM 2011 QUES 67-78

 70 Open this post in threaded view
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## Re: JNU ECOM 2011 QUES 67-78

 In reply to this post by Arushi :)) Thanxx Arushi... MA Economics DSE 2014-16
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## Re: JNU ECOM 2011 QUES 67-78

 In reply to this post by Arushi :)) plz do qno 74
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## Re: JNU ECOM 2011 QUES 67-78

 I am getting 74(a). Please explain why its b? :) “Operator! Give me the number for 911!”
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## Re: JNU ECOM 2011 QUES 67-78

 Q.74 The number formed will be divisible by 5 if the number formed by the last digit on extremely right (i,e.unit place) is divisible by 5. such no. are 5 and 0 so the no. of arrangements 9*8*7*2=1008 but we have to reduce those case where the 0 on the extremely left because if 0 is on extremely left then we get only 3 digit no. those cases are 8*7=56 so total no. of arrangement 1008-56=952
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## Re: JNU ECOM 2011 QUES 67-78

 Oh right, got it now! thanks! “Operator! Give me the number for 911!”
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## Re: JNU ECOM 2011 QUES 67-78

 In reply to this post by jack thanku