1) A sum of money becomes 4140 of itself in 14 years at certain rate of simple interest. The rate of interest per annum is A) 10% B) 1% C) 2.5% D) 5% E) 12% Answer: Option AExplanation:Let P=1, SI =4140−1 =140 Rate % =(100∗SI)P×N =(140×1001×14) = 10%