Question 742536
Is the interest rate an annual rate?<P>
The formula for compound interest is {{{A=P*e^rt}}} where P is principal amount, r is the annual rate, t is the time in years, A is the amount after that time, and e is the constant approx. 2.71828183<P>
To find P...apply some algebra:  {{{A/(e^rt) = P}}}
A.  36 months is 3 years.  {{{25000/(e^(.09*3))}}}=  $19,084.49<P>
B. 9 years:  {{{25000/(e^(.09*9))}}} = $11,121.45