-8.28% is the change from 870 to 798
Calculation steps:
[( 798 - 870 ) ÷ 870] x 100 = -8.28%
Formula
Percentage change = [(798 - 870) / 870] x 100
Subtract the new number by the original number
798 - 870 = -72
-72 ÷ 870 = -0.08275862068965517
-0.08275862068965517 x 100 = -8.28%