4) Hamm Corp. purchased a truck on January 1, Year 1 for $100,000. The truck is estimated to have a 10-year life and salvage value of $10,000. The company uses the straight-line method. a. At the beginning of Year 3, Hamm revises the expected life to 7 years, what is the new annual depreciation expense? b. At the beginning of Year 3, Hamm keeps the life the same, but changes the salvage value to $20,000. What is the new annual depreciation expense?