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R<br />
15 Veto<br />
follow us: facebook.com/vetotrivandrum 15<br />
15. A certain sum of money doubles itself in 5<br />
years at simple interest. In how many years it<br />
becomes 7 times?<br />
a. 15 b. 20 c. 30 d. 25<br />
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N = 5 x ( 7 - 1 ) = 5 x 6 = 30<br />
Ans: (c)<br />
16. A certain sum of money doubles itself in 16<br />
years at simple interest. In how many years it<br />
becomes 3 times?<br />
a. 12 b. 20 c. 26 d. 32<br />
N = 16 x (3-1) = 16 x 2 = 32<br />
Ans: (d)<br />
17. A person invests a certain sum at a certain rate<br />
of simple interest for 4 years. Had he invested<br />
it at 2% higher, he would have earned Rs. 240<br />
more. find the sum he invested.<br />
a. 3000 b. 2000<br />
c. 4000 d. 5000<br />
Short cut<br />
Difference in interest earned×100<br />
Investment = Time×Difference in rate of interest<br />
Here I = 240 N = 4 years r = 2%<br />
100I<br />
100×<br />
240<br />
P = = = 3000<br />
rN 2×<br />
4<br />
Ans: (a)<br />
Previous questions on simple interest<br />
1. In how many years will a sum of money<br />
triple itself, the rate of interest being<br />
10%?<br />
(a) 15 years (b) 20 years<br />
(c) 10 years (d) 18 years<br />
[University Asst. 2016]<br />
Ans: (a) 15 years<br />
2. Gokul took a certain amount as a loan<br />
from a bank at the rate of 8% simple<br />
interest per annum and gave the same<br />
amount to Alok as a loan at the rate of<br />
12% simple interest per annum. If at<br />
the end of 12 years he made a profit<br />
of Rs.480. In the deal, what was the<br />
original amount?<br />
(a) Rs.2000 (b Rs.1000<br />
(c) Rs.3000 (d) Rs.4000<br />
[Asst. Gr.II. KSB]<br />
Ans: (b) Rs.1000<br />
3. If a sum of money at simple interest<br />
double itself in 6 years, it will become<br />
four times in<br />
(a) 14 years (b) 12 years<br />
(c) 18 years (d) 16 years<br />
[Cochin University Asst. Gr. II]<br />
Ans: (c) 18 years<br />
4. At what rate percent of simple interest<br />
will sum of money double itself in 12<br />
years?<br />
(a) 33/4% (b) 25/3%<br />
(c) 17/2% (d) 19/2%<br />
[Deputy Collector - 2011]<br />
Ans: (b) 25/3%<br />
5. What is the simple interest for Rs.8000<br />
at 8% per annum?<br />
(a) 64 (b) 640<br />
(c) 160 (d) 1600<br />
[LDC - Beverages]<br />
Ans: (b) 640<br />
6. At simple interest in how many years<br />
will a sum of money double itselt at 12%<br />
per annum?<br />
(a) 8 years 6 months<br />
(b) 8 years 5 months<br />
(c) 8 years 8 months<br />
(d) 8 years 4 months<br />
[Sales Asst. 2013]<br />
Ans: (d) 8 years 4 months<br />
7. A sum of money amount of Rs.8000<br />
in 2 years and Rs.9500 in 3 years. the<br />
rate of simple interest is:<br />
(a) 20% (b) 25%<br />
(c) 30% (d) 31.57%<br />
[Forester - 2012]<br />
Ans: (c) 30%<br />
8. An amount becomes Rs.11300 in 2<br />
years and Rs.12600 in 4 years. The<br />
rate, if calculated at simple interest is:<br />
(a) 13% (b) 10.5%<br />
(c) 6.5% (d) 8.5%<br />
[Fireman (Trainee) - 2010]<br />
Ans: (c) 6.5%<br />
9. Interest on Rs.1000 for 146 days at the<br />
rate of 10% per annum?<br />
(a) 80 (b) 45<br />
(c) 50 (d) 40<br />
[Sales Man / Women - 2010]<br />
Ans: (d) 40<br />
10. At what percentage per annum will a<br />
sum of money double in 8 years?<br />
(a) 10% (b) 11%<br />
(c) 12% (d) 12.5%<br />
[Fireman (Trainee) - 2009]<br />
Ans: (d) 12.5<br />
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