6. 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 are x and y units when the corresponding unit prices are p=20051x101yandq=160101x41y dollars, respectively. a) What is the weekly total revenue function R(x,y) ? b) What is the total revenue realized by Country Workshop Manufacturers if it sells 200 finished rolltop desks and 140 unfinished rolltop desks