Can you explain and show how to do each?

2) In order to send your first child, who was bom today, to Law School when the time comes, you want to accumulate $40,000 at the end of 18 years. Assuming that your savings account will pay 6% compounded annually, how much you would have to deposit assuming that: Your savings account will pay 6% compounded annually, for the whole 18 years, how much would you have to deposit today? (3 points) b. Your savings account will pay 6% compounded annually, for the first 10 years, and 7.5% for the remaining 8 years, how much would you have to deposit today? (5 points)