-9.77% is the change from 870 to 785
Calculation steps:
[( 785 - 870 ) ÷ 870] x 100 = -9.77%
Formula
Percentage change = [(785 - 870) / 870] x 100
Subtract the new number by the original number
785 - 870 = -85
-85 ÷ 870 = -0.09770114942528736
-0.09770114942528736 x 100 = -9.77%