4. Giant Corp. purchased a truck on January 1, Year 1 for $75,000. The truck is estimated to have a 5 year life and salvage value of $15,000. The company uses the straight line method. a) At the beginning of Year 3, Giant revises the expected life to 7 years, what is the new annual depreciation expense? b) At the beginning of Year 3, Giant keeps the life the same, but changes the salvage value to $10,000. What is the new annual depreciation expense