Hi ! I need help with this problem. If anyone could help me with it I would really apperciate it! Accounting isnt my best subject and im really bad with numbers.

Exercise 9-7

Tanger Company purchased a delivery truck for $36,000 on January 1, 2014. The truck has an expected salvage value of $6,000, and is expected to be driven 100,000 miles over its estimated useful life of 8 years. Actual miles driven were 15,000 in 2014 and 12,000 in 2015.

Calculate depreciable cost per unit.

Answer: Depreciable Cost Per Unit is = 0.3 per mile.

Is that correct? And how do I go about doing this next equation

Question: Compute depreciation expense for 2014 and 2015 using the straight-line method, the units-of-activity method, and the double-declining-balance method.

If someone could help me! I would be really thankful! Im struggling in this area of accounting.