Whiskey Business bought machinery during 2020 as follows and records depreciation using the nearest whole month method: Machinery Cost Date of Plant and Purchase Equipment Item September 10 Machinery Estimated Useful Life Residual Value Estimated Units Produced $168,0006 years $27,600 260,000 Required: 1. Calculate the depreciation expense recorded on December 31, 2021 using the Units of Production Method. Actual Units produced in 2021 was 79,000. Note: In 2020, the depreciation recorded for the machinery was 23,220. The formula for Units of Production is: Cost - Residual Value Total Estimated Production x Actual Units Produced. Select one: O a. 14,220 O b. 23,400 O c. 23,220 O d. 42,660