-62.5% is the change from 56 to 21
Calculation steps:
[( 21 - 56 ) ÷ 56] x 100 = -62.5%
Formula
Percentage change = [(21 - 56) / 56] x 100
Subtract the new number by the original number
21 - 56 = -35
-35 ÷ 56 = -0.625
-0.625 x 100 = -62.5%
Example