-71.61% is the change from 870 to 247
Calculation steps:
[( 247 - 870 ) ÷ 870] x 100 = -71.61%
Formula
Percentage change = [(247 - 870) / 870] x 100
Subtract the new number by the original number
247 - 870 = -623
-623 ÷ 870 = -0.7160919540229885
-0.7160919540229885 x 100 = -71.61%