6.25% is the change from 800 to 850
Calculation steps:
[( 850 - 800 ) ÷ 800] x 100 = 6.25%
Formula
Percentage change = [(850 - 800) / 800] x 100
Subtract the new number by the original number
850 - 800 = 50
50 ÷ 800 = 0.0625
0.0625 x 100 = 6.25%
Example