1. What is the amount of interest earned after two years on a $100 deposit paying 4 percent simple interest annually?
2. What is the amount of compound interest earned after three years on a $100 deposit paying 8 percent interest annually?
3. A business just took out a loan for $100,000 at 10% interest. If the business pays the loan off in three months, how much did the business pay in interest?
4. What is the annual percentage yield (APY) for a deposit paying 5 percent interest with monthly compounding?