-53.25% is the change from 830 to 388
Calculation steps:
[( 388 - 830 ) ÷ 830] x 100 = -53.25%
Formula
Percentage change = [(388 - 830) / 830] x 100
Subtract the new number by the original number
388 - 830 = -442
-442 ÷ 830 = -0.5325301204819277
-0.5325301204819277 x 100 = -53.25%