Question: If the present worth of a sum is $2000 and the true discount is $400, what is the rate of interest per annum for 2 years?
Options:
Correct Answer: 10%
Solution:
True Discount = Present Worth * Rate * Time / 100. 400 = 2000 * Rate * 2 / 100. Rate = (400 * 100) / (2000 * 2) = 10%.