Answer:
a)11.25 dollars
b)450 dollars
Explanation:
90 dollars for 8 hours
x dollars for 1 hour
90/x = 8/1
cross multiply/solve for x
8x=90
x=11.25
11.25 dollars for 1 hour
x dollars for 40 hours
11.25/x=1/40
cross multiply/solve for x
1x=11.25*40
x=450