In how much time would the simple interest on a certain sum be 0.125 times the principal at 10% per annum?
Answer: A
Let sum = x. Then, S.I. = 0.125x = 1/8 x, R = 10%
Time = (100 * x) / (x * 8 * 10) = 5/4 = 1 1/4 years.