-71.26% is the change from 870 to 250
Calculation steps:
[( 250 - 870 ) ÷ 870] x 100 = -71.26%
Formula
Percentage change = [(250 - 870) / 870] x 100
Subtract the new number by the original number
250 - 870 = -620
-620 ÷ 870 = -0.7126436781609196
-0.7126436781609196 x 100 = -71.26%