-61.11% is the change from 54 to 21
Calculation steps:
[( 21 - 54 ) ÷ 54] x 100 = -61.11%
Formula
Percentage change = [(21 - 54) / 54] x 100
Subtract the new number by the original number
21 - 54 = -33
-33 ÷ 54 = -0.6111111111111112
-0.6111111111111112 x 100 = -61.11%