-13.79% is the change from 870 to 750
Calculation steps:
[( 750 - 870 ) ÷ 870] x 100 = -13.79%
Formula
Percentage change = [(750 - 870) / 870] x 100
Subtract the new number by the original number
750 - 870 = -120
-120 ÷ 870 = -0.13793103448275862
-0.13793103448275862 x 100 = -13.79%