4. Calculate the unit cost per cubic yard achieved in the following situation: A crew comprising 4 laborers and 0.5 of a labor foreman is observed to take 3 days (24 hours) to excavate by hand 40 cubic yards of heavy soil. (Note that 0.5 of a foreman is included because the foreman is attached to this crew for only 50% of the time.) The wage rate of laborers is $40.00 per hour, and of foremen $44.00 per hour