80.25% is the change from 400 to 721
Calculation steps:
[( 721 - 400 ) ÷ 400] x 100 = 80.25%
Formula
Percentage change = [(721 - 400) / 400] x 100
Subtract the new number by the original number
721 - 400 = 321
321 ÷ 400 = 0.8025
0.8025 x 100 = 80.25%