21.  A sum of money lent out at SI amount to Rs.7000 after 2 years and Rs.14000 after a further period of 5yrs. Find the principal?

Rs.3700
Rs.4200
Rs.5100
Rs.6300

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Answer: Option  B Explanation:SI for 5 yrs = 14000(7yr) – 7000(2yr) = 7000
SI for 2 yrs = 7000*2/5 = 2800
P = 7000 – 2800 =4200 ```

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22.  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%

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

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23.  A sum of money becomes 7/4 of itself in 5years at a certain rate of interest. What is the rate of interest?

22%
20%
18%
15%

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Answer: Option  D Explanation:SI = 7/4x – 1 = x(7– 4)/4 = 3x/4
R = 3x/4*100/x*5 = 300/20 = 15% ```

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24.  In what time will Rs.3500 become Rs. 4700 at 4(1/5)%pa SI?

5yrs
8yrs
9yrs
6yrs

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Answer: Option  B Explanation:SI = 4700 – 3500 = 1200
R = 21/5%
SI = PNR/100
1200 = 3500*21*N/100*5
N = 1200*100*5/3500*21 = 8.16 = 8yrs ```

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25.  The banker's discount on Rs.1600 at 15% per annum is the same as true discount on Rs.1680 for the same time and at the same rate. The time is?

3 months
4 months
6 months
8 months

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Answer: Option  B Explanation:S.I.on Rs.1600 = T.D. on Rs.1680.
Therefore Rs.1600 is the P.W. of Rs.1680, i.e.,Rs.80 is S.I. on Rs.1600 at 15%
Therefore Time = (100*80/1600*15) year = 1/3 year = 4 months ```

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