years 2 through 4 , and 300,000km the last year. 1. Compute US Air's first-year depreciation on the plane using the following methods: a. Straight-line c. Double-diminishing-balance Requirement 1. Compute US Air's first-year depreciation on the plane. a. Using the straight-line method, depreciation is $3350000. (Hold all decimals during interim calculations. Round the final solution to the nearest whole number.) c. Using the double-diminishing-balance method, depreciation is (Hold all decimals during interim calculations. Round the final solution to the nearest whole number.) results in the highest carrying amount and will vary depending on the use of the asset. method results in the lowest carrying amount since it writes off a amount of the asset's cost near the start of its useful life