-66.9% is the change from 870 to 288
Calculation steps:
[( 288 - 870 ) ÷ 870] x 100 = -66.9%
Formula
Percentage change = [(288 - 870) / 870] x 100
Subtract the new number by the original number
288 - 870 = -582
-582 ÷ 870 = -0.6689655172413793
-0.6689655172413793 x 100 = -66.9%