Question

the time by which a sum of money is 8times of itself if it double itself in 15years

Answer 1

A sum of money doubles itself at a compound interest in 15 years . In how may years it will become 8 times ?? If the sum doubles (x2) in 15 years, then it to become 2*2*2 = 8 times as large it should double three times, so three 15 years time period are needed, which is 3*15 = 45 years.