I need help with these questions

1. (10 points) For the cash flow shown below, find the present worth at year 0. Assume i = 6% $7,200 $3.660 $3.930 $4.200 $22,300 2. (10 points) Two engineering graduates who recently got married are planning for their early retirement 18 years from now. They believe that they will need $2.000.000 in year 18. Their plan is to live on one of their salaries and invest the other. They already have $50,000 in their investment account. How much will they have to invest each year if the account grows at a rate of 10% per year