# Simple Interest 1/3

17. The simple interest on a sum of money will be Rs.600 after 10 years. If the principal is tripled after 5 years, what will be the total interest at the end of the tenth year?
a. Rs.600
b. Rs.900
c. Rs.1200

18. A lent Rs.600 to B for 2 years and Rs.150 to C for 4 years and received all together from both Rs.90 as simple interest. The total interest is :
a. 4%
b. 5%
c. 10%
d. 12%

19. A certain sum of money at simple interest amounts to Rs.1260 in 2 years and to Rs.1350 in 5 years. The rate percent per annum is :
a. 2.5%
b. 3.75%
c. 5%
d. 7.5%

20. A sum of money at simple interest amounts to Rs.2240 in 2 years and Rs.2600 in 5 years. The sum is :
a. Rs.1880
b. Rs.2000
c. Rs.2120

21. Rs.800 amounts to Rs.920 in 3 years at simple interest. If the interest rate is increased by 3% , it would amount to how much ?
a. Rs.1056
b. Rs.1112
c. Rs.1182
d. Rs.992

22. At a certain rate of simple interest, a certain sum doubles itself in 10 years. It will triple itself in :
a. 15 years
b. 20 years
c. 30 years
d. 12 years

23. A sum of money will double itself in 6 years at simple interest with yearly rate of :
a. 10%
b. $16\displaystyle\frac{2}{3}$%
c. 8%
d. 16%

24. The simple interest on a sum of money is $\displaystyle\frac{1}{9}$ of the principal and the number of years is equal to the rate percent per annum. The rate percent per annum is :
a. 3
b. $\displaystyle\frac{1}{3}$
c. $3\displaystyle\frac{1}{3}$
d. $\displaystyle\frac{3}{{10}}$