-70.11% is the change from 870 to 260
Calculation steps:
[( 260 - 870 ) ÷ 870] x 100 = -70.11%
Formula
Percentage change = [(260 - 870) / 870] x 100
Subtract the new number by the original number
260 - 870 = -610
-610 ÷ 870 = -0.7011494252873564
-0.7011494252873564 x 100 = -70.11%