-97.45% is the change from 824 to 21
Calculation steps:
[( 21 - 824 ) ÷ 824] x 100 = -97.45%
Formula
Percentage change = [(21 - 824) / 824] x 100
Subtract the new number by the original number
21 - 824 = -803
-803 ÷ 824 = -0.9745145631067961
-0.9745145631067961 x 100 = -97.45%