-81.2% is the change from 266 to 50
Calculation steps:
[( 50 - 266 ) ÷ 266] x 100 = -81.2%
Formula
Percentage change = [(50 - 266) / 266] x 100
Subtract the new number by the original number
50 - 266 = -216
-216 ÷ 266 = -0.8120300751879699
-0.8120300751879699 x 100 = -81.2%