The large parts of a playground A-frame (from which to hang a swing or glider) consist of a ridge pole, four legs, and two side braces. Each pair of legs fastens to the ridge with one fastener set.
Each side brace requires two fastener sets for attachment to the legs. Each fastener set includes one zinc-plated bolt, one lock-washer, and one nut.
There is one order outstanding, to make 80 frame kits. There are 200 legs in inventory. There are no other large items in inventory, and no scheduled receipts. Fasteners are available from the small parts area.
a. Draw the product structure tree
b. Calculate the net requirements to fulfil the outstanding order.