Key Question #8 Natalie and Preston would like to accumulate $25 000 at the end of 3.5 years for a future down payment on a house in Prescott. How much should they deposit at the end of each week in a savings account that pays 7.2%/a, compounded monthly, to meet their goal? a. Draw a time line to represent the annuity. b. Write the series that represents the amount of the annuity. C. Determine the weekly deposit