Multiple choice Interest on Rs.500 at the rate of 5% is Rs.100. The time is 1 years 4 years 10 years 20 years Reveal answer Fill a bubble to check yourself B Correct answer Explanation Simple interest formula: I = (P * R * T) / 100. 100 = (500 * 5 * T) / 100. 100 = 25 * T. T = 100 / 25 = 4 years.