How much do you need to deposit in your saving account in today$$s money, which earns $10\%$ compound interest, to be able to collect $$8,574\mathrm{.}35$ in $8$ years? Solve this problem using the mathematical method showing all steps. Then solve the problem using Excel present value $($PV$)$ calculations $($show the changes in saving over all $8$ years, take a snap shot of the excel sheet