-98.42% is the change from 824 to 13
Calculation steps:
[( 13 - 824 ) ÷ 824] x 100 = -98.42%
Formula
Percentage change = [(13 - 824) / 824] x 100
Subtract the new number by the original number
13 - 824 = -811
-811 ÷ 824 = -0.9842233009708737
-0.9842233009708737 x 100 = -98.42%