Estimating Useful Life, Percent Used Up, and Gain or Loss on Disposal of $2,591 million. The property and equipment footnote follows. Required a. Compute the average useful life of Husky Energy's depreciable assets in 2018. Assume that land is 10\% of "Refining." Note: Round your answer to one decimal place (for example, enter 6.8 for 6.77555). years b. Estimate the percent used up of Husky Energy's depreciable assets in 2018. Note: Round percentage to one decimal place (for example, enter 6.7\% for 6.6555\%). % year. Assume that Husky Energy received $4 million cash proceeds for the year. Determine the gain or loss on the disposal. Note: Do not use any negative signs with your answers. Gain Loss No gain or loss