d. Activity method based on hours worked Year 1$ Year 2$ e. Activity method based on units of output Year 1$ Year 2$ 3. If Gruman used a service life of 8 years or 15,000 hours and a residual value of $9,000, what would be the effect on the following under the straight-line, sum-ofthe-years'-digits, and double-declining-balance depreciation methods? Depreciation expense a. Straight-line method Year 1 \$ Year 2 \$ b. Sum-of-the-years'-digits method Year 1 \$ Year 2$ c. Double-declining-balance method Year 1$ Year 2$ Book value a. Straight-line method Year 1$ Year 2 \$ b. Sum-of-the-years'-digits method Year 1 \$ Year 2$ c. Double-declining-balance method Year 1$ d. Activity method based on hours worked Year 1$ Year 2$ e. Activity method based on units of output Year 1$ Year 2$ 3. If Gruman used a service life of 8 years or 15,000 hours and a residual value of $9,000, what would be the effect on the following under the straight-line, sum-ofthe-years'-digits, and double-declining-balance depreciation methods? Depreciation expense a. Straight-line method Year 1 \$ Year 2 \$ b. Sum-of-the-years'-digits method Year 1 \$ Year 2$ c. Double-declining-balance method Year 1$ Year 2$ Book value a. Straight-line method Year 1$ Year 2 \$ b. Sum-of-the-years'-digits method Year 1 \$ Year 2$ c. Double-declining-balance method Year 1$