Reducing balance depreciation calculation
(E.g.) Van price £16000, 20% depreciation, historic value 1st yr. £16000
Yr.1. 16000x0.20=3200 16000-3200=£12800 (current value)
Yr.2. 12800x0.20=2560 12800-2560=£10240 (current value)
Yr.3. 10240x0.20=2048 10240-2048=£8192 (net book value)