-50.24% is the change from 830 to 413
Calculation steps:
[( 413 - 830 ) ÷ 830] x 100 = -50.24%
Formula
Percentage change = [(413 - 830) / 830] x 100
Subtract the new number by the original number
413 - 830 = -417
-417 ÷ 830 = -0.5024096385542168
-0.5024096385542168 x 100 = -50.24%