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?