2.91% is the change from 721 to 742
Calculation steps:
[( 742 - 721 ) ÷ 721] x 100 = 2.91%
Formula
Percentage change = [(742 - 721) / 721] x 100
Subtract the new number by the original number
742 - 721 = 21
21 ÷ 721 = 0.02912621359223301
0.02912621359223301 x 100 = 2.91%