1.  A certain sum of money at simple interest amounts to ₹ 1012 in 2 years and to ₹ 1067.20 in 4 years. The rate of interest per annum is:
A. 2.5%
B. 3%
C. 4%
D. 5%

Answer: Option C

Explanation:

S.I. for 1 years = ₹ (1067.20 - 1012) = ₹ 55.20

S.I. for 2 years = ₹ (55.20 x 2/3 x 5/2)
= ₹ 92.

Principal = ₹ (1012 - 92) = ₹ 920.

Rate = 100 x 92 x 2 % = 4%
920 x 5