Final answer:
The present value formula is used to determine how much to deposit today to accumulate a specific amount in the future at a given interest rate. In these scenarios, one must calculate the present value for $66,000 in 4 years at 9% interest, $18,500 in 2 years at 8% interest, and the future value of $787 over 10 years at 9% interest.
Step-by-step explanation:
To calculate how much you would have to deposit today to have $66,000 in four years at an annual interest rate of 9%, you can use the present value formula which is PV = FV / (1 + i)^n. Here, FV is the future value of $66,000, i is the interest rate (0.09 in decimal form), and n is the number of years (4 years). Plugging in the values, we get PV = $66,000 / (1 + 0.09)^4, which, upon calculation, gives us the amount that needs to be deposited today.
Similarly, to have $18,500 in two years at an interest rate of 8%, use the formula again with FV as $18,500, i as 0.08, and n as 2. This gives us PV = $18,500 / (1 + 0.08)^2.
Finally, to calculate the future value of an investment of $787 for ten years at an interest rate of 9%, we use the future value formula FV = PV (1 + i)^n. This gives us FV = $787 * (1 + 0.09)^10. Calculation of these values will give us the respective amounts rounded to the nearest whole dollar or two decimal places as required.