At a certain rate of simple interest, a principal becomes three times in \(15\) years. In how many years will the

[AAPL]

At a certain rate of simple interest, a principal becomes three times in \(15\) years. In how many years will the principal amount become nine times?

A. \(45\) years
B. \(30\) years
C. \(60\) years
D. \(75\) years
E. None of these

OA C