Erwin Company, a calendar year taxpayer, made only two purchases of depreciable personalty this year. The first
purchase was five-year recovery property costing $312,800, and the second purchase was seven-year recovery property costing $574,000. Compute Erwin's first-year MACRS depreciation with respect to the personalty assuming that:
a. The first purchase occurred on February 2, and the second purchase occurred on June 18.
b. The first purchase occurred on February 2, and the second purchase occurred on October 13.