ANSWERS - HURDLE 08 : COMPOUND AND SIMPLE INTEREST

Ans 1: D, When time is 1 year , CI = SI.

Ans 2: 15000 * [ {(1 + R/100)^2 - 1} - {2R/100} ] = 54
15000 * [ (R/100)^2 ] = 54
R^2 = 540/15 = 36
R=6

Ans 3 : P [ ((1.05)^2 - 1) - (2*5)/100 ] = 25
P = 10,000

Ans 4 : 72
Ans 5 : 2000 * [(1 + R/100) ^3 - 1 - 3R/100 ] =62
2000 * [1 + 3R/100 + 3(R/100)^2 + (R/100)^3 - 1 - 3R/100 ] = 62
2000 * [(R/100)^2 { R/100 + 3}] = 62
(R/100)^2 [ (R/100) + 3 ] = 31/1000
R^2[R + 300] = 31000 = 10^2[10 + 300]
R=10


Ans 6 : Let the amount kept at 5% C.I for 2 years be X
The difference in C.I and S.I = 30
so 30 = { [X(1+5/100)(1+5/100)] -X }-(X.5.2/100)
or 30 = X(21/20)(21/20)-X-X/10
or 30= 441X/400-X-X/10
or 30= x/400
so X=12,000
http://groups.yahoo.com/group/urpercentile/

Ans 7. Let the amount kept at 6 % C.I for 2 years be Y
The difference in C.I and S.I = 108
so 108 = Y(1+6/100)(1+6/100)-Y- (Y.6.2/100)
so 108= Y(53/50)(53/50)-Y -(6Y/50)
so 108 = 9Y/2500
so Y = 30,000


Ans 8 . Interest in first Investment (taking help from ANS6 )
= (441*12000)/ 400 -12000 = 1230 (UrPercentile.com)
Interest on second investment (taking help from Ans 7)
= 30000.(53/50).53(50)-30,000= 3708
Total interest = 1230+3708= 4938

Ans 9: Put the formula to get the answer 8820.

Ans 10: Total Bonus = 42,000 which is 5 % of his annual salary
So his salry = 42,000*20 = 840,000

Ans 11: Let sum be X
4944= X(1+6/100)(1+6/100)-X
or 4944= X.(53/50).(53/50)-X
solve the equation to get X= 40,000

Ans 12:
C.I = 40,000.(21/20).(21/20).(21/20)-40,000
C.I =6,305


Ans13 : 20,000

Ans14 : 576

Ans15 : 16,000

Ans16 : 3,661

Ans 17 : B, Ans 18 : C, Ans19 : A, Ans 20 : G, Ans 21 : H, Ans 22 : I

Ans23 : Boycott is the closest word to proscribe in the passage, hence the answer is Charles C Boycott

Ans24 : Jingo means a zealous patriot, so chavinist is the closest word in the given passage. So answer is Nicolas Chauvin