-56.25% is the change from 48 to 21
Calculation steps:
[( 21 - 48 ) ÷ 48] x 100 = -56.25%
Formula
Percentage change = [(21 - 48) / 48] x 100
Subtract the new number by the original number
21 - 48 = -27
-27 ÷ 48 = -0.5625
-0.5625 x 100 = -56.25%
Example