Country Workshop manufactures both finished and unfinished furniture for the home. The estimated quantities demanded each week of its rolltop desks in the finished and unfinished versions arexandyunits when the corresponding unit prices in dollars,pandq, are described respectively in the following equations.

p=530- 1x - 1 y

8 3

q=6001x - 1y

8 9

(a) What is the weekly total revenue functionR(x,y)?