-12.79% is the change from 305 to 266
Calculation steps:
[( 266 - 305 ) ÷ 305] x 100 = -12.79%
Formula
Percentage change = [(266 - 305) / 305] x 100
Subtract the new number by the original number
266 - 305 = -39
-39 ÷ 305 = -0.12786885245901639
-0.12786885245901639 x 100 = -12.79%