-50.12% is the change from 830 to 414
Calculation steps:
[( 414 - 830 ) ÷ 830] x 100 = -50.12%
Formula
Percentage change = [(414 - 830) / 830] x 100
Subtract the new number by the original number
414 - 830 = -416
-416 ÷ 830 = -0.5012048192771085
-0.5012048192771085 x 100 = -50.12%