please asap!!!

1) (10 pts). If you invest $1,000 in an account that pays 2% every 6 months, approximately how many years will it take to have $2,000 ? 2) (10 pts.) If you gave a bank $12,000 and got back $12,300 at the end of 6 months, what was the nominal AND effective interest rates that your investment earned? 3) (15 pts.) The maintenance cost for the car you just bought will be $350 the first year, the cost is expected to increase by $250 a year after that, and you plan to keep the car for 15 years. A company offers you maintenance insurance for a lump sum to be paid now. What is the maximum amount you should be willing to pay for it, if i 6%