Concord Bus Lines uses the units-of-activity method in depreciating its buses. One bus was purchased on January 1, 2020, at a cost of $307,780. Over its6-year useful life, the bus is expected to be driven181,200miles. Salvage value is expected to be $8,800.

depreciation schedule assuming actual mileage was: 2020,51,200; 2021,34,000; 2022,52,000; and 2023,44,000.

please help me out am having problems calculating the book value