The book value at the end of a given year is calculated by subtracting the annual depreciation amount from previous year's book value.
Book value at the end of 1st year = 
Book value at the end of 2 nd year = 
Similarly the book values at the end of other years have been calculated in the same manner. The annual depreciation amount and book values at end of years using straight-line depreciation method are presented in Table 3.1. For straight-line method, the book value at the end of different years can also be calculated by using equation (3.7). For example, the book value at the end of 2nd year is given by;
For double-declining balance method , the constant annual depreciation rate ‘dm' is given by;
The book value at the end of a given year is calculated by subtracting the annual depreciation amount from previous year's book value.
Book value at the end of 1 st year = 
Book value at the end of 2 nd year = 
Similarly the annual depreciation and book value at the end of other years have been calculated in the same manner and are presented in Table 3.1.
The book value at the end of different years can also be calculated by using equation (3.17). Using this equation, the book value at the end of 2nd year is given by;
Table 3.1 Depreciation and book value of the construction equipment using straight-line method and double-declining balance method
