Whispering A.. purchased a piece of equipment at the beginning of 2019 . The equipment cost t652,600. It has an estimated service life of 8 years and an expected residual value of t 91,000 . The sum-of-the-years'-digits method of depreciation is being used. Someone has already correctly prepared a depreciation schedule for this asset. This schedule shows that t78,000 will be depreciated for a particular calendar year. Determine for what particular year the depreciation amount for this asset will be t78,000. Year of depreciation