A business purchased a new car at the start of October for $16,800cash. The car has a useful life of 4 years and residual value of $2,400. The business has a 30 june year end. If the business uses the reducing balance method of depreciation, at the rate of 25% per year, what will the depreciation expense be at year end? a. $4200 b. $3600 c. $2700 d. $3150 e. None of the above