1. On January 2, 2018, Country Lumber installed a computerized machine in its factory at a cost of $168,000. The machines useful life was estimated at four years or a total of 190,000 units with a $35,000 trade-in value. Country Lumbers year-end is December 31. Calculate depreciation for each year of the machines estimated useful life under each of the following methods:

1. Straight-line
2. Double-declining-balance
3. Units-of-production, assuming actual units produced were:

Year

2018

2019

2020

2021

Units

39,900

43,550

54,200

72,000

Year	a. Straight-Line	b. Double-Declining-Balance	c. Units-of-Production
2018
2019
2020
2021
Total