Engineering economy(hipolita, st. maria) 3rd ed. solution
#0183;#32;A cement grinding mill A with a capacity of 50 tons per hour utilizes forged steel grinding balls costing P12,000 per ton, which have a wear rate of 100 grams per ton cement milled. Another cement mill B of the same capacity uses high chrome steel grinding balls costing P50,000 per ton with a wear rate of 20 grams per ton cement milled.