A firm purchased computer-aided drafting and machining equipment at the
beginning of the year for \(\$ 420,000\). The machine has an expected useful
life of six years and a \(\$ 38,000\) residual value.
a. Calculate the annual depreciation expense for the first four years of the
equipment's life using the straight-line method.
b. Calculate the annual depreciation expense for the first four years of the
equipment's life using the double-declining-balance method.
c. Calculate the annual depreciation expense for the first four years of the
equipment's life, using the sum-of-the-years'-digits method.
d. Comment on the differences in your results. Which method would managers
prefer if they are trying to maximize their net income? Which method is
preferred if the objective is to minimize income taxes? Why?
e. Using double-declining-balance depreciation, calculate depreciation expense
through the sixth year. What adjustment to depreciation should be made in the
sixth year?