1.  At CI, if a certain sum of money is doubled in 4 years, then the amount will be four fold in how many years ?


5 years
8 years
9 years
None of these


Answer

 Option

2n = 2*4 = 8 years

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2.  A sum of money amount to Rs.900 in 3 yrs and Rs.1080 in 4yrs at CI. What is the rate of CI pa ?


5%
10%
15%
20%


Answer

 Option

(1080-900/900)*100 180*100/900 = 20%

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3.  The difference between CI and SI on an amount Rs. 15000 for 2 year is Rs.96.What is the rate of interest per annum ?


8
12
10
7


Answer

 Option

(15000*(1+(r/100)^2-15000) - (15000*r*2/100)=96 15000{[100+r)^2/100)-1-(2r/100]} = 96 15000[{100+r^2 - 1000-200r}/10000 = 96 r^2 = 64 r = 8

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4.  At what rate of CI pa will a sum of Rs.1000 becomes Rs.1040.4 in 2yrs ?


3%
2%
4%
5%


Answer

 Option

1000*(1+(R/100)) 2 = 1040.4 (1+(R/100)) 2 = 1040.4/1000 (1+(R/100)) 2 = 10404/10000 = (102/100) 2 R = 2%

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5.  In how many years will a sum of Rs.15625 at 8% pa compounded semi annually become Rs.17,576?


3 years
5 years
1(1/2) years
2 years


Answer

 Option

15625*(1+(4/100))2n = 17576 15625*(104/100) 2n = 17576 (26/25) 2n = 17576/15625 = (26/27)3 2n = 3 N =3/2 = 1(1/2) yrs

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