-46.99% is the change from 830 to 440
Calculation steps:
[( 440 - 830 ) ÷ 830] x 100 = -46.99%
Formula
Percentage change = [(440 - 830) / 830] x 100
Subtract the new number by the original number
440 - 830 = -390
-390 ÷ 830 = -0.46987951807228917
-0.46987951807228917 x 100 = -46.99%