-23.72% is the change from 721 to 550
Calculation steps:
[( 550 - 721 ) ÷ 721] x 100 = -23.72%
Formula
Percentage change = [(550 - 721) / 721] x 100
Subtract the new number by the original number
550 - 721 = -171
-171 ÷ 721 = -0.23717059639389737
-0.23717059639389737 x 100 = -23.72%