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Use the information below to answer the questions that follow. Enter your answers using digits only - no dollar signs, commas, or decimal points. The business's year-end is December 31 . Cost of equipment =105000 Useful life in years =3 Residual value =15000 Date purchased = January 31 What is the depreciation expense per year? A What is the depreciation expense per month? A. What is the depreciation expense in the year of purchase? A