Question 824732
Hello, 
Let's set up two equations to solve this:
80x + 100y = 320
80x +  75y = 270 
Subtract these to get: 
25x = 50
y = 2
Solve for x and we get:
x = 1.5 
So the make $1.50
Make sense?
RJ
www.math-unlock.com