assume a fixed asset cost of $10,000 and a useful life of 5 years. in commencing to compute double-declining depreciation, the double-declining factor is computed as follows: first, the $10,000 cost of the fixed asset is divided by the asset's useful life of 5 years to equal 20%, or a factor of 0.20. next, multiply the factor of 0.20 by what amount to arrive at the proper double-declining factor?