answer the cost and present economy

1.A cement grinding mill "A" with a capacity of 50 tons/hr utilizes forged steel grinding balls costing P12T/ton, which have a wear

rate of 100 grams/ton cement milled. Another cement mill "B" of the same capacity uses high chrome steel grinding balls costing

P50T/ton with wear rate of 20 grams/ton cement milled. Determine the more economical grinding mill, considering other factors

to be the same.