You need to have $24,000 to pay for your party in 3 years. How much do you need to deposit today in a bank that pays 4% interest, compounded annually, in order to achieve your goal?

You invested $100,000 6 years ago at 8.5% annual interest rate. If you invest another $1,500 a year, for 15 years at the same 8.5% annual rate, how much will you have 15 years from now?