Operation costing (chapter appendix). Farkas Shoes, a high-end shoe manufacturer, produces two lines of shoes for women. The shoes are identical in design, but differ in the materials used and the trim added to the shoes. The basic shoes are made from a synthetic leather, have a synthetic insole, and have plain buttons decorating the upper. The elaborate shoes are made from genuine leather, have a special insole, and have creative buttons applied to the upper. Each shoe is assumed to use an identical amount of conversion costs for a given operation. Work orders 10399 and 10400 are representative work orders for the two types of shoes.