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# Simple Interest 1/2

9. The rate of interest on a sum of money is 4% per annum for the first 2 years, 6% per annum for the next 4 years and 8% per annum for the period beyond 6 years. If the simple interest occured by the sum for a total period of 9 years is Rs.1120, what is the sum?
a. Rs.1500
b. Rs.2000
c. Rs.2500
d. Rs.4000

10. Two equal amounts of money are deposited in two banks, each at 15% per annum, for $3\displaystyle\frac{1}{2}$ and 5 years. If the difference between their interest is Rs.144, each sum is :
a. Rs.460
b. Rs.500
c. Rs.640
d. Rs.720

11. The difference between the interests received from two different banks on Rs.500 for 2 years, is Rs.2.50.The difference between their rates is :
a. 1%
b. 0.5%
c. 2.5%
d. 0.25%

12. A certain sum of money at simple interest amounts to Rs.1012 in $2\displaystyle\frac{1}{2}$years and to Rs.1067.20 in 4 years. The rate of interest per annum is :
a. 2.5%
b. 3%
c. 4%
d. 5%

13. At simple interest, a sum doubles after 20 years. The rate of interest per annum is :
a. 5%
b. 10%
c. 12%

14. The simple interest on a sum of money at 8% per annum for 6 years is half the sum. The sum is :
a. Rs.4800
b. Rs.6000
c. Rs.8000

15. A sum of money becomes $\displaystyle\frac{8}{5}$ of itself in 5 years at a certain rate of interest. The rate percent per annum is :
a. 5%
b. 8%
c. 10%
d. 12%

16. In how many years will sum of money double itself at 12% per annum?
a. 6 years 9 months
b. 8 years 3 months
c. 7 years 6 months
d. 8 years 4 months