-7.5% is the change from 920 to 851
Calculation steps:
[( 851 - 920 ) ÷ 920] x 100 = -7.5%
Formula
Percentage change = [(851 - 920) / 920] x 100
Subtract the new number by the original number
851 - 920 = -69
-69 ÷ 920 = -0.075
-0.075 x 100 = -7.5%
Example