-42.79% is the change from 909 to 520
Calculation steps:
[( 520 - 909 ) ÷ 909] x 100 = -42.79%
Formula
Percentage change = [(520 - 909) / 909] x 100
Subtract the new number by the original number
520 - 909 = -389
-389 ÷ 909 = -0.42794279427942794
-0.42794279427942794 x 100 = -42.79%