81.61% is the change from 397 to 721
Calculation steps:
[( 721 - 397 ) ÷ 397] x 100 = 81.61%
Formula
Percentage change = [(721 - 397) / 397] x 100
Subtract the new number by the original number
721 - 397 = 324
324 ÷ 397 = 0.8161209068010076
0.8161209068010076 x 100 = 81.61%