-27.64% is the change from 720 to 521
Calculation steps:
[( 521 - 720 ) ÷ 720] x 100 = -27.64%
Formula
Percentage change = [(521 - 720) / 720] x 100
Subtract the new number by the original number
521 - 720 = -199
-199 ÷ 720 = -0.2763888888888889
-0.2763888888888889 x 100 = -27.64%