-13.22% is the change from 870 to 755
Calculation steps:
[( 755 - 870 ) ÷ 870] x 100 = -13.22%
Formula
Percentage change = [(755 - 870) / 870] x 100
Subtract the new number by the original number
755 - 870 = -115
-115 ÷ 870 = -0.13218390804597702
-0.13218390804597702 x 100 = -13.22%