20. Which of the following is NOT a way of calculating the amount of depreciation for each period? a. straight-line method b. declining-balance method c. sum-of-the-years'-digit method d. weighted average method 24. Use the following data: Asset cost $80,000 Expected life 3 years Estimated salvage value $10,000 Using the sum-of-the-year's-digits method, the amount of depreciation for the first year would be (3 points)