Question : At what annual rate (rounded off to the nearest integer) of simple interest will a sum of money become five times its initial value in 18 years?

Question : Simple interest on a certain sum is one-fourth of the sum and the interest rate per annum is four times the number of years. If the rate of interest increases by 2%, then how much will the simple interest (in INR) be on INR 3,600 for 6 years?

Question : A certain sum becomes 4 times of itself in 5 years at a rate of simple interest. In 15 years it will become how many times of itself at the same rate of simple interest?

Question : If a sum of money at simple interest becomes 45 times in 110 years, then in how many years will that sum become 23 times?

Question : In $t$ years, the simple interest earned on a certain amount at the rate of 10% per annum is $\frac{5}{8}$th of the principal amount. If the rate of interest is made three-fourths of 10% and the simple interest remains the same, which of the following statements is true about