Rectangular area A = 28 ft x 18 ft
. A = 504 ft2
Quarter paint area Q = 85 ft2
Then divide A/Q = 5.92 = 5 + 0.92
In consecuence are needed 5 quarters of paint, that costs
5x 12.50 = 62.5
Add a fraction of 0.92 ,that costs. 0.92 x12.50 = 11.5
Then Carrie have to pay
62.5 + 11.5 = 74
Answer is $ 74 dollars