3% is the change from 700 to 721
Calculation steps:
[( 721 - 700 ) ÷ 700] x 100 = 3%
Formula
Percentage change = [(721 - 700) / 700] x 100
Subtract the new number by the original number
721 - 700 = 21
21 ÷ 700 = 0.03
0.03 x 100 = 3%
Example