4. Imvestment problems [future values]: a. For her retirement, Starah Jane plans to invest \$15,000 each year for 30 yearn. Calculate how much she will have when she retires if she earns 8% per year. 15000((1+.08)1(301).08=(1,699,248.17 b. From Question "a", calculate how much she will have when she retires if she invests $15,000 each year for 30 years but makes quarterly payments. c. From Question "a", calculate how much she will have when she retires if she invests $8,000 each year for 30 years but makes semi-annual payments: d. From Question " a ", calculate how much she will have when she retires if she starts investing funds immediately. e. From Question " b ", calculate how much she will have when she retires if she starts investing funds immediately. f. [Extra credit, using the time equation. Round to 2 decimals]. If Sarah Jane wants to have $1,500,000 when she retires and can invest $100,000 now at an expected rate of return of 8%, calculate the number of years before she can retire