4. Karnes Company purchased a truck for $38,000. The company expected the truck to last four years or 100,000 miles, with an estimated residual value of $4,000 at the end of that time. During the second year the truck was driven 27,000 miles. Compute the depreciation for the second year under each of the methods below and place your answers in the blanks provided. Units-of-activity Double-declining-balance 5. On January 1, 2011, Lakeside Enterprises purchased natural resources for $1,800,000. The company expects the resources to produce 12,000,000 units of product. (a) What is the depletion cost per unit? (b) If the company mined and sold 20,000 units in January, what is depletion expense for the month