Givens
Total = T = 200
Fixed = F = 20
Hours = h = 4
Rate = r = ??
Formula
C = F + h * r
Solve
200 = 20 + 4*r Subtract 20 from both sides
200 - 20 = 4r
180 = 4r Divide by 4
180/4 = r
r = 45 dollars an hour <<< Answer
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