-48.43% is the change from 830 to 428
Calculation steps:
[( 428 - 830 ) ÷ 830] x 100 = -48.43%
Formula
Percentage change = [(428 - 830) / 830] x 100
Subtract the new number by the original number
428 - 830 = -402
-402 ÷ 830 = -0.4843373493975904
-0.4843373493975904 x 100 = -48.43%