-51.33% is the change from 830 to 404
Calculation steps:
[( 404 - 830 ) ÷ 830] x 100 = -51.33%
Formula
Percentage change = [(404 - 830) / 830] x 100
Subtract the new number by the original number
404 - 830 = -426
-426 ÷ 830 = -0.5132530120481927
-0.5132530120481927 x 100 = -51.33%