Welcome to the forum Jeremy. Not to sound nerdy but the receipt should show $11.50/CWT but they just got lazy and scribbled 11.50/cw. The CWT stands for The hundredweight or centum weight, and as Joe posted you received 11.5 cents a pound. You can expect to be paid by the lb for your copper, aluminum, and non-magnetic stainless.

Best of luck to you.