Included are entries from a journal kept by a reporter for the Oquawka Spectator newspaper who traveled with one of the wagon trains, which apparently both departed from Oquawka on the 25th of March, 1850.
The double declining balance depreciation method is an accelerated depreciation method that counts twice as much of the assetâs book value each year as an expense compared to straight-line depreciation. The formula is:
1 The 3-, 5-, 7-, and 10-year classes use 200% and the 15- and 20-year classes use 150% declining balance depreciation. 2  All classes convert to straight-line depreciation in the optimal year, shown with an asterisk  (*). A half-year depreciation is allowed in the first and last recovery years.