-18.69% is the change from 824 to 670
Calculation steps:
[( 670 - 824 ) ÷ 824] x 100 = -18.69%
Formula
Percentage change = [(670 - 824) / 824] x 100
Subtract the new number by the original number
670 - 824 = -154
-154 ÷ 824 = -0.18689320388349515
-0.18689320388349515 x 100 = -18.69%