A firm that produces electric golf carts has just received an order for 200 carts, which must be ready for delivery at the start of week 8. Information concerning the product structure, lead times, and quantities on hand is shown in the following table. Use this information to do each of the following: a. Construct a product tree. b. Construct an assembly time chart. c. Develop a material requirements plan that will provide 200 golf carts by week 8 assuming lot for lot ordering.