If we write as an equation the info described in the problem we have:
(1/4)x = 5000
that is, x is the total price of the car including interest rate included, because the other 3/4 will be financed. We solve for x:
x = 4*5000
x = 20000
that is, the car cost will be 20000 including interest rate that is 1%, so we are looking at the 101%, that is, 100% of the car cost plus 1% of interest rate included, so we use a rule of three simple with direct proportion to solve:
101% ------> $20000
100% ------> y
y = (100)(20000)/101
y = 19801
so the total of the car is $19801
