In a decision to keep or replace a piece of machinery, the total yearly expense of keeping the old machinery using the following data is: Old acquisition cost $ 100 000 The total life of both old and new equipment: 4 years Variable cost $ 80 000 Cost of new machinery $ 50 000 Total accumulated depreciation $ 75 000 O a. $105,000 b. $25,000 c. $95,000 O d. $80,000 e. $103,500