• question_answer A sum of Rs. 12, 500 amounts to Rs. 15, 500 in 4 years at the rate of simple interest. What is the rate of interest? A) 3%                               B) 4%C) 5%                               D) 6%

Suppose rate of interest = r% Then,  $15,500=12,500+\frac{12,500\times 4\times r}{100}$ $\frac{12500\times 4\times r}{100}=3000$ $r=\frac{3000\times 100}{12500\times 4}$ $=6%$