25% is the change from 800 to 1000
Calculation steps:
[( 1000 - 800 ) ÷ 800] x 100 = 25%
Formula
Percentage change = [(1000 - 800) / 800] x 100
Subtract the new number by the original number
1000 - 800 = 200
200 ÷ 800 = 0.25
0.25 x 100 = 25%
Example