-88.72% is the change from 266 to 30
Calculation steps:
[( 30 - 266 ) ÷ 266] x 100 = -88.72%
Formula
Percentage change = [(30 - 266) / 266] x 100
Subtract the new number by the original number
30 - 266 = -236
-236 ÷ 266 = -0.8872180451127819
-0.8872180451127819 x 100 = -88.72%