15% is the change from 800 to 920
Calculation steps:
[( 920 - 800 ) ÷ 800] x 100 = 15%
Formula
Percentage change = [(920 - 800) / 800] x 100
Subtract the new number by the original number
920 - 800 = 120
120 ÷ 800 = 0.15
0.15 x 100 = 15%
Example