During the current year, Danny - a calendar-year taxpayer - acquired and placed in service the following business assets:
January: Delivery trucks $ 55,000
March: real estate building 150,000 used for warehouse.
June: Computer system 35,000
September: Automobile 25,000
November: Office equipment 95,000
Which convention(s) is(are) used to figure Danny's depreciation for the current year and why?