11. A sum of money amounts to Rs. 9800 after 5 years and Rs. 12005 after 8 years at the same rate of simple interest. The rate of interest per annum is:

A. 5%
B. 8%
C. 12%
D. 15%

12. What will be the ratio of simple interest earned by a certain amount at the same rate of interest for 6 years and that for 9 years?

A. 1 : 3
B. 1 : 4
C. 2 : 3
D. Data inadequate
E. None of these

13. A certain amount earns simple interest of Rs. 1750 after 7 years. Had the interest been 2% more, how much more interest would it have earned?

A. Rs. 35
B. Rs. 245
C. Rs. 350
D. Cannot be determined
E. None of these

14. A person borrows Rs. 5000 for 2 years at 4% p.a. simple interest. He immediately lends it to another person at 6 1/2% p.a for 2 years. Find his gain in the transaction per year.

A. Rs. 112.50
B. Rs. 125
C. Rs. 225
D. Rs. 167.50