-55.4% is the change from 870 to 388
Calculation steps:
[( 388 - 870 ) ÷ 870] x 100 = -55.4%
Formula
Percentage change = [(388 - 870) / 870] x 100
Subtract the new number by the original number
388 - 870 = -482
-482 ÷ 870 = -0.5540229885057472
-0.5540229885057472 x 100 = -55.4%