16.  If the difference between CI and SI earned on a certain amount at 15% pa at the end of 3 years is Rs.3200, find out the principal?

Rs.45150
Rs.45000
Rs.42560
Rs.42560

```Answer

Answer: Option  A Explanation:Sum = D*1003/r2(300+r)
S = 3200*1003/152(300+15)
S = 3200*100*100*100/225*315
= 45149.9 = 45150 ```

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17.  A lent 2000rs to B at 8% annual rate of interest and some amount to C at same rate of interest for same period of time. If after 5 years, A got a total of 1500 rupee as interest. Find the sum lent to C?

1750
1700
1650
1500

```Answer

Answer: Option  A Explanation:Solution: 1500 = 2000*(8/100)*5 + X*(8/100)*5 ```

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18.  A sum of 8000 rupees is divided between two people A and B at the rate of interest of 4% and 5% respectively. The total interest earned after 2 years is equal to 750. Then find the ratio of investment between A and B?

7:11
6:11
5:11
3:11

```Answer

Let A get X rupees and B get 8000-X rupees.
750 = X*(4/100)*2 + (8000-X)*(5/100)*2
X =2500 and 8000-2500 = 5500
Ratio 5:11 ```

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19.  Priya borrows 1000 rupees at the rate of 11% per annum on SI and rahul borrows 780 rupees at the rate of 15% per annum on SI. In how many years will the amount of debt of priya and rahul be equal?

32.2/7yrs
32.1/7yrs
31.2/7yrs
31.3/7 yrs

```Answer

1000 + 1000*(11/100)*T = 780 + 780*(15/100)*T ```

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20.  At what percent per annum will be SI on sum of money is equal to 3/5 of the amount in 5 years?

40%
30%
20%
10%

```Answer

Answer: Option  B Explanation:Sol => SI = 3/5(SI +P)
(P*R*5)/100 = 3/5[(P*R*5)/100 + P] R =30 ```

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