Please complete the full question $($don$\text{'}$t just give me a formula, I will be completing this on excel if that is easier! Question $3$: You just got a loan for $$15,000$ and you plan to pay it off in three years. Your monthly payments are $$500$ each. What is the interest rate that the bank is charging you? What if you did bimonthly payments of $$250?$ How much sooner will the loan be paid off?

Question $4$: You plan to retire in $25$ vears and you want to receive $$7,000$ per month for the remainder of your life $(35$ years in retirement$).$ The first payment is received the day you retire. Assuming a constant $3\mathrm{.}5\%$ interest $($compounded monthly$),$ how much money will you need on the day you retire? Let's assume you have $$35,000$ saved for retirement today, how much will you need to put away each month to reach your goal.