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

Answer: Option  B Explanation: 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

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

Answer: Option  A Explanation:(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

Answer: Option  B Explanation: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

Answer: Option  C Explanation: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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