Simple interest - Jamb Mathematics Past Questions and Answers

Question 16:

• JAMB 1990

At what rate would a sum of N100.00 deposited for 5 years raise an interest of N7.50?

A. \(\frac{1}{2}\)%
B. 2\(\frac{1}{2}\)%
C. 1.5%
D. 25%

Question 17:

• JAMB 1991

Musa borrows N10.00 at 2% per month simple interest and repays N8.00 after 4 months. How much does he still owe

A. N10.80
B. N10.67
C. N2.80
D. N2.67

Question 18:

• JAMB 1992

A man invested a sum of N280.00 partly at 5% and partly at 4%. if the total interest is N12.80 per annum, find the amount invested at 5%

A. 14.00
B. 120.00
C. 140.00
D. 160.00

Question 19:

• JAMB 1993

If N225.00 yields N27.00 in x years simple interest at the rate of 4% per annum, find x

A. 3
B. 4
C. 12
D. 17

Question 20:

• JAMB 1993

If \(\sqrt{x^2 + 9}\) = x + 1, solve for x

A. 5
B. 4
C. 3
D. 2
E. 1