-6.21% is the change from 885 to 830
Calculation steps:
[( 830 - 885 ) ÷ 885] x 100 = -6.21%
Formula
Percentage change = [(830 - 885) / 885] x 100
Subtract the new number by the original number
830 - 885 = -55
-55 ÷ 885 = -0.062146892655367235
-0.062146892655367235 x 100 = -6.21%