26.  A certain sum of money amounts to Rs.800 in 2 years and to Rs. 920 in 3 years then the sum is?

420
580
560
500

```Answer

Answer: Option  C Explanation:Trick: (A2 –  A1)/ T2-T1
(920-800)  /1 = 120
P = 800-240 = 560 ```

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27.  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

Answer: Option  C Explanation:Solution:
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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28.  A Principal amount give Rs.12750 as SI for 7 years at the rate of 10% to get the same amount of interest of 10 years, what will be the rate of interest?

4%
9%
7%
5%

```Answer

Answer: Option  C Explanation:SI = PNR/100
=  12750*7*10/100 = 8925
SI = 8925
R = 8925*100/12750*10 = 7 ```

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29.  A certain sum of money at certain rate of interest becomes Rs 3420 after 2 years and at same rate after two and a half years becomes Rs 3525. Find the rate percent per annum?

11%
10%
7%
8.5%

```Answer

Answer: Option  C Explanation:Amount after 2.5 yrs = 3525, after 2 yrs = 3420
So SI for half yr = 3525-3420 = 105, so for 1 yr SI = 105*2 = 210
P + 2*SI = 3420
So P = 3420 – 2*210 = 3000
So 3000*r*2/100 = 420 ```

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30.  A sum of money becomes 8 times at SI rate of 5% p.a. At what rate percent will it become twelve fold?

None of these
7(6/7)%
5(6/7)%
6(6/7)%

```Answer

Answer: Option  B Explanation:[ (m-1) *r ] / n-1
[(12-1) *5] /(8-1) ```

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