A project to move packed earth requires you to decide whether to use a
dozer/scraper operation or excavator/truck operation. Determine the most
economical operation based on the dozer/scraper operation estimated at
$1.25/cy. All equipment carries a rated heaped capacity, has a fill factor
of 100%, and works 45-min hours. Excavator costs $95/hr (including
operator), cycle time is 0.28 min, and bucket heaped capacity is 5.0 cy.
Truck costs $150/hr (including operator), dump time is 0.5 min
(maneuver, dump, turn), heaped capacity is 31.7 cy, and 12 trucks are
available for the project. Hauling equipment operates in one direction
from A to B to C and finally to D.