Lux Company started the month with 20 lamps in its beginning inventory that cost $30 each. During the month, Lux purchased 80 additional lamps for $31 each. At the end of the month, Lux counted its inventory and found that 25 lamps remained unsold. Of Lux uses periodic weighted average cost, its Cost of Goods Sold for the month is .

You are considering the purchase of one of two machines used in your manufacturing plant. machine 1 has a life of two years, costs $20,000 initially, and then $4,000 per year in maintenance costs. machine 2 costs $25,000 initially, has a life of three years, and requires $3,500 in annual maintenance costs. either machine must be replaced at the end of its life with an equivalent machine. using eac which is the better machine for the firm