-9.94% is the change from 905 to 815
Calculation steps:
[( 815 - 905 ) ÷ 905] x 100 = -9.94%
Formula
Percentage change = [(815 - 905) / 905] x 100
Subtract the new number by the original number
815 - 905 = -90
-90 ÷ 905 = -0.09944751381215469
-0.09944751381215469 x 100 = -9.94%