2. A machine shop purchases Min tons of metal each month. Seventy-five percent of the metal is used to complete jobs for clients (M) and two percent of the metal is kept at the shop as demo pieces for prospective clients (this is an "accumulation"). The rest of the metal is considered scrap (M.); ninety percent of the scrap is recycled and the rest (10%) is swept from the floors to be thrown in the trash. a) Draw a materials balance for the machine shop's metal use. b) What percentage of Min is thrown in the trash each month? For full credit, clearly write out all the steps for the material balance approach including: a) drawing a figure, b) writing out the mass balance governing equation. c) Solve your equation using symbols rather than numbers first d) Box your final answer.