1. The problem statement, all variables and given/known data An investment is made at 12.5% annual simple interest. Find the number of years it will take for the cumulative value of the interest to equal the original investment? 2. Relevant equations V=P(1+rt) Where V= interest on Amount P = Principal amount r= interest rate t= number of years for which amount is invested 3. The attempt at a solution Simple Interest formula is: V=P(1+rt) Let p =10 & t=1 V= 10(1+12.5) = 135 In just one year the interest obtained is more than the Principal value. Some body please guide me. What I understand is that, I have to find the number of years in which the interest obtained & added (with previous years’ interest becomes equal to the Principal). Zulfi.