Question 22 6 pts Brawn Corporation purchased an equipment on January 1, 2018 for P 720,000 with an estimated salvage value of P 80,000 and an estimated useful life of four years. Per projection, the equipment is to produce 180,000 units of product S5 within its working hours of 20,000 throughout its useful life. In 2018, the company produced 35,000 units of S5 using 7,800 hours of the equipment. On the other hand, 25,000 units of S5 were produced in 2019 using 5,250 working hours of the equipment. Using working hours method, compute for the following: 1. Depreciation expense for 2018 - 2. Depreciation expense for 2019 - 3. Net book value as of December 31, 2019