1. Find the unknown quantity, assuming compound interest: 2. A recent graduate invests 4000 in a stock mutual fund. If a conservative estimate of after-tax compound interest is 8%, how many years...

1. Find the unknown quantity, assuming compound interest:

2. A recent graduate invests
4000 in a stock mutual fund. If a conservative estimate of after-tax compound interest is 8%, how many years would it take to buy a
16,000 car using the fund? Solve by the rule of 72.