Quote: Okay, so once again I've been having troubles with a couple of questions and need help! They need to be solved using either the steps of TVM (total value of money calculator) or using the equations A=P(1+i)^n. Here are those questions:

1. Barb invests $15,000 for 7 years and it doubles in value. What interest rate, compounded quarterly was the money invested at?

2. How much longer will it take $25,000 to amount to $100,000 if it is invested at 5% compounded annually compared to 8% quarterly?