-96.24% is the change from 266 to 10
Calculation steps:
[( 10 - 266 ) ÷ 266] x 100 = -96.24%
Formula
Percentage change = [(10 - 266) / 266] x 100
Subtract the new number by the original number
10 - 266 = -256
-256 ÷ 266 = -0.9624060150375939
-0.9624060150375939 x 100 = -96.24%