The Go-Fast Car Company (GFCC) has a large excess inventory of two paint colors (G1 and G2). The first color (G1) has 11 percent blue paint and 89 percent green paint. The second color (G2) has 22 percent blue paint and 78 percent green paint. Marketing has suggested that customers are satisfied when there is at least 18 percent blue paint in the mixture. If the cost of G1 is \($7.50\)/gallon and the cost of G2 is \($13.50\)/gallon

a. what percentage of G1 can be mixed with G2 and still satisfy the customers?

b. what is the resulting paint cost per gallon?