-98.18% is the change from 824 to 15
Calculation steps:
[( 15 - 824 ) ÷ 824] x 100 = -98.18%
Formula
Percentage change = [(15 - 824) / 824] x 100
Subtract the new number by the original number
15 - 824 = -809
-809 ÷ 824 = -0.9817961165048543
-0.9817961165048543 x 100 = -98.18%