-90.41% is the change from 824 to 79
Calculation steps:
[( 79 - 824 ) ÷ 824] x 100 = -90.41%
Formula
Percentage change = [(79 - 824) / 824] x 100
Subtract the new number by the original number
79 - 824 = -745
-745 ÷ 824 = -0.904126213592233
-0.904126213592233 x 100 = -90.41%