In the choice of mechanical equipment you are required to submit your recommendation as to which of the two steam shovels for earth excavation is better to buy. The basis is 20 year service & interest at 7%. Taxes & insurance are the same in each case: 5% & 1% respectively. Use Annual Cost & CC. 50-ton shovel 70 ton shovel First Cost P30k P38k Life 20 years 20 years Salvage value P2k P3k Annual Operation P15k P17k Annual Upkeep P1.5k P2k Annual Output 150k yards 200k yards