-51.45% is the change from 830 to 403
Calculation steps:
[( 403 - 830 ) ÷ 830] x 100 = -51.45%
Formula
Percentage change = [(403 - 830) / 830] x 100
Subtract the new number by the original number
403 - 830 = -427
-427 ÷ 830 = -0.5144578313253012
-0.5144578313253012 x 100 = -51.45%