E9-5 Copacabana Bus Lines uses the units-of-activity method in depreciating its buses. One bus was purchased on January 1, 2014, at a cost of R$145,000. Over its 4-year useful life, the bus is expected to be driven 100,000 miles. Residual value is expected to be R$15,000. Instructions (a) Compute the depreciable cost per unit. (b) Prepare a depreciation schedule assuming actual mileage was: 2014, 26,000; 2015, 32,000; 2016, 25,000; and 2017, 17,000.