On January 1, 2018, Air Canadians purchased a used airplane for $37,000,000.

Air Canadians expects the plane to remain useful for five years (4,000,000 miles)

and to have a residual value of $5,000,000. The company expects the plane to

be flown 1,400,000 miles during the first year. What would be the depreciation

expense for the first year under normal depreciation, double declining and units

of production method. Which method would you suggest the company to use

and?