25. Find the final F value, given that P=1,500. They value i% keep changing over the next 15 years as follows: 5% for the first 4 years, 8% for the next 5 years and 10% for the last 6 years. Need to calculate. 26. In 10 years $15,000 will be withdrawn from and account that maintained an interest rate of 10% throughout the 10 years. How much was the present value? Need to calculate. 27. Chris makes a deposit of $500 into his savings account at the beginning of each year for the next 20 years. If the account earns 5% interest rate per year compounded annually, what will be the future value at the end of 20 years? Need to calculate. 28. For a car loan of $15000 paid monthly over a 5 year period with an annual interest rate of 6% what will be the difference between simple and compound interest monthly payment. Need to calculate