The Large Parts of a Playground A-Frame (From Which to Hang

Essay

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 leg fastens to the ridge with one fastener set. Each side brace requires two fastener sets for attachment to the legs.
There is one order outstanding, to make 180 frame kits. There are 500 legs and 20 ridge poles in inventory. There are no other large items in inventory, and no scheduled receipts.
(a) Draw the product structure tree.
(b) Calculate the net requirements to fulfill the outstanding order.