show how to solve the next 3 problems(show work)

1. You are starting your four-year college education today, and you are worried if you have enough money in your account for tuition and fees. You are going to pay $15,000 a year at the beginning of each school year starting today. If the interest rate on your account is 7%, compounded annually, how much should you have in your account today? Round to the nearest cent.

2. How much would an investor be willing to pay for an investment which promises to pay $200 per year in perpetuity if the investor requires a 14 percent return on the investment? Round to the nearest cent.

3. If you are going to receive $70,000 for 20 years starting 5 years from now, what is the present value of the cash flows discounted at 12%? Round to the nearest cent. (2 decimal)