a couple wants to have $40,000 in 5 years for a down payment on a new house.

a) how much could they deposit today, at 6.4% compounded quarterly, to have the required amount in 5 years?

b)how much interest will be earned?

c)if they can deposit only $20,000 now, how much more will they need to complete the $40,000 after 5 years?