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 . (1) What is the depreciation expense per year? (2) What is the depreciation expense per month? (3) What is the depreciation expense in the year of purchase