-38.47% is the change from 824 to 507
Calculation steps:
[( 507 - 824 ) ÷ 824] x 100 = -38.47%
Formula
Percentage change = [(507 - 824) / 824] x 100
Subtract the new number by the original number
507 - 824 = -317
-317 ÷ 824 = -0.38470873786407767
-0.38470873786407767 x 100 = -38.47%