When estimating a job to bid, a contractor’s estimator first determines the actual cost of labor using the functionL(h) = 28.75h, where h is the number of estimated hours it will take to complete the job. Next, the estimator adds the labor burden, which accounts for taxes and insurance, using the function B(L) = 1.78L. Finally, the estimator calculates the selling price, including the markup for overhead and profit, using the function M(B) = 1.43B.
Substitute each function into the next: M(B(h)) = 1.43 × (1.78 × 28.75h). First, 1.78 × 28.75 = 51.175; then 1.43 × 51.175 = 73.18025. Therefore, M(B(h)) = 73.18025h, which is choice A.
AI-written and checked against the verified answer.