-49.76% is the change from 830 to 417
Calculation steps:
[( 417 - 830 ) ÷ 830] x 100 = -49.76%
Formula
Percentage change = [(417 - 830) / 830] x 100
Subtract the new number by the original number
417 - 830 = -413
-413 ÷ 830 = -0.4975903614457831
-0.4975903614457831 x 100 = -49.76%