Susan invested $5000.00 at 10% compounded semiannually. In how many years will susan's investment have tripled? Round your answers to the nearest tenth. 2. Originally Posted by fran_eric_07 Susan invested$5000.00 at 10% compounded semiannually. In how many years will susan's investment have tripled? Round your answers to the nearest tenth.
$A = 5000 \left( 1 + \frac{5}{100}\right)^n$ where n is the number of half years.
So solve $15000 = 5000 \left( 1 + \frac{5}{100}\right)^n$ for n.