-47.23% is the change from 830 to 438
Calculation steps:
[( 438 - 830 ) ÷ 830] x 100 = -47.23%
Formula
Percentage change = [(438 - 830) / 830] x 100
Subtract the new number by the original number
438 - 830 = -392
-392 ÷ 830 = -0.472289156626506
-0.472289156626506 x 100 = -47.23%