Tanger Company purchased a delivery truck for R$38,000 on January 1, 2017. The truck has an expected residual value of R$6,000, and is expected to be driven 100,000 miles over its estimated useful life of 5 years. Actual miles driven were 15,000 in 2017, 12,000 in 2018, 19,000 in 2019, 24,000 in 2020 and 30,000 in 2021.

Instructions: Compute depreciation expense and schedule for the following methods for depreciation with explanation. 

1. Straight-line method.

2. Units-of-activity method.

 3. Double-declining-balance method (double the straight-line rate).