15.12% is the change from 721 to 830
Calculation steps:
[( 830 - 721 ) ÷ 721] x 100 = 15.12%
Formula
Percentage change = [(830 - 721) / 721] x 100
Subtract the new number by the original number
830 - 721 = 109
109 ÷ 721 = 0.15117891816920942
0.15117891816920942 x 100 = 15.12%