-54.22% is the change from 830 to 380
Calculation steps:
[( 380 - 830 ) ÷ 830] x 100 = -54.22%
Formula
Percentage change = [(380 - 830) / 830] x 100
Subtract the new number by the original number
380 - 830 = -450
-450 ÷ 830 = -0.5421686746987951
-0.5421686746987951 x 100 = -54.22%