1. Parents agree to invest $600 (at 10%, compounded semiannually) for their son on the December 31 or June 30 following each semester that he makes the dean's list during his 4 years in college. If he makes the dean's list in each of the 8 semesters, how much money will his parents have to give him when he graduates?(Round your answer to the nearest cent.)

2. A small business owner contributes $1000 at the end of each quarter to a retirement account that earns 10% compounded quarterly. (a) How long will it be until the account is worth $150,000? (Round your answer to the nearest quarter.) (b) Suppose when the account reaches $150,000, the business owner increases the contributions to $8000 at the end of each quarter. What will the total value of the account be after 15 more years?

3. Grandparents plan to open an account on their grandchild's birthday and contribute each month until she goes to college. How much must they contribute at the beginning of each month in an investment that pays 12%, compounded monthly, if they want the balance to be $100,000 at the end of 18 years?(Round your answer to the nearest cent.)