-18.81% is the change from 824 to 669
Calculation steps:
[( 669 - 824 ) ÷ 824] x 100 = -18.81%
Formula
Percentage change = [(669 - 824) / 824] x 100
Subtract the new number by the original number
669 - 824 = -155
-155 ÷ 824 = -0.18810679611650485
-0.18810679611650485 x 100 = -18.81%