-79.7% is the change from 266 to 54
Calculation steps:
[( 54 - 266 ) ÷ 266] x 100 = -79.7%
Formula
Percentage change = [(54 - 266) / 266] x 100
Subtract the new number by the original number
54 - 266 = -212
-212 ÷ 266 = -0.7969924812030075
-0.7969924812030075 x 100 = -79.7%