30.85% is the change from 551 to 721
Calculation steps:
[( 721 - 551 ) ÷ 551] x 100 = 30.85%
Formula
Percentage change = [(721 - 551) / 551] x 100
Subtract the new number by the original number
721 - 551 = 170
170 ÷ 551 = 0.308529945553539
0.308529945553539 x 100 = 30.85%