True Flight Golf manufacturers a popular shaft for golf clubs. Its trade secret is a unique process for weaving high - tension wire into the center of the shaft such that energy is accumulated during the swing and released at impact. A specialized machine costing $3,000,000 is utilized in the manufacturing process. The machine has a 3 - year life and no salvage value. True Flight uses straight - line depreciation. During the year, 25,000 shafts were produced, and the company was operating at full capacity. $700,000 of wire was used during the year. (a) Is machinery depreciation fixed or variable? Is wire fixed or variable