A. 6 years 3 months
B. 7 years 9 months
C. 8 years 3 months
D. 9 years 6 months
A sum of money trebles itself in 15 years and 6 months at simple interest. In how many years will it double itself at the same rate?
A. 6 years 3 months
B. 7 years 9 months
C. 8 years 3 months
D. 9 years 6 months