You are bidding on a project that requires the excavation of 500,000 Bank Cubic Yards of Common Earth. You have the option of either using a Large Excavator or a combination Dozer and Loader to excavate the earth. The Excavator costs $220 per hour with the operator included. The Excavator Bucket is 2 1/2 Loose Cubic Yards. The Dozer costs $155 per hour and the Loader costs $140 per hour. The Dozer blade has a capacity of 10 Loose Cubic Yards and the Bucket of the Loader has a capacity of 6 Loose Cubic Yards. Trucking must be included as well. You will use Trailer Dumps that can carry 25 Loose Cubic Yards and costs $110 per hour. The site where you can Stockpile the excavated material is a 40-minute round trip (20-minutes travel time in each direction). The plan is to work 8 hours per day, 5 days per week.

a.) Calculate the cost to excavate the material for each alternative.

b.) Calculate the time to excavate the material for each alternative.

c.) Give a recommendation on which alternative to use.