Lena Horn bought a Toyota Tundra on January 1 for $37,200 with an estimated life of 5 years, The residual value of the truck is $6,200. Assume a straight-line method of depreciation. a. What will be the book value of the truck at the end of year 4 ? b. If the Tundra was bought the first year on April 12, how much depreciation would be taken the first year