P4 revision questioin

HI John I have question on paper DEC 13, Q1. in the examiner's answer, for the year5, examiner deducted the depreciation 125, and balancing allowance125 to get the taxable profit, and then added later. I want to ask could I deducted depreciation125 to get the taxable profit and added back. calculating the balancing charges separately like 125*25%.? is that right? thanks John