A- Furniture Company makes book shelves and desks. Each shelf requires 2 hours for carpentry work and 1 hour for painting. Each desk requires 3 hours for carpentry and 4 hours for painting. The...

A- Furniture Company makes book shelves and desks. Each shelf requires 2 hours for carpentry work and 1 hour for painting. Each desk requires 3 hours for carpentry and 4 hours for painting. The company has a maximum of 60 hours of carpentry work and 40 hours of painting available each week, and they make a profit of $15 per shelf and $40 per desk. How many shelves and how many desks should they make (using graphical method)?