16. S During the first two years, SON, Inc., drove the truck 100,000 and 110,000 miles, respectively, to deliver merchandise to its customers. The company originally purchased the truck for $150,000. If the truck has an estimated life of 4 years or 400,000 miles, with an estimated residual value of $50,000, what amount of depreciation expense should SON record in the second year using the activity-based method? 17. $ JMM Corporation purchased equipment at the beginning of Year 1 for $300,000. In Years 1-4, JMM depreciated the asset on a straight-line basis with an estimated useful life of 10 years and a $10,000 residual value. What is the BOOK VALUE of the equipment at the beginning of Year 5? Use the following to answer questions 18 - 19 AD Enterprises purchased equipment for $400,000 on January 1, year 1. The equipment is expected to have a 4-year life, with a residual value of $50,000 at the end of its service life. 18. $ Using the double-declining balance method, determine depreciation expense for year 2. 19. S Using the straight-line method, determine book value at the end of year 2.