-19.54% is the change from 870 to 700
Calculation steps:
[( 700 - 870 ) ÷ 870] x 100 = -19.54%
Formula
Percentage change = [(700 - 870) / 870] x 100
Subtract the new number by the original number
700 - 870 = -170
-170 ÷ 870 = -0.19540229885057472
-0.19540229885057472 x 100 = -19.54%