-72.18% is the change from 870 to 242
Calculation steps:
[( 242 - 870 ) ÷ 870] x 100 = -72.18%
Formula
Percentage change = [(242 - 870) / 870] x 100
Subtract the new number by the original number
242 - 870 = -628
-628 ÷ 870 = -0.7218390804597701
-0.7218390804597701 x 100 = -72.18%