Using the drawing of a pair of scissors below, do the following: a. Draw the product structure tree for the scissors. b. Perform MRP for the scissors and all its components except the screw. Lead times are one day for buying each type of blade, assembling the blades with grips, and for final scissors assembly, but two days for buying each type of plastic grip. Six hundred pairs of scissors are needed on Day 6. Note: there are 200 straight blades, 350 bent blades, and 40 top blade assemblies on hand.