321.64% is the change from 171 to 721
Calculation steps:
[( 721 - 171 ) ÷ 171] x 100 = 321.64%
Formula
Percentage change = [(721 - 171) / 171] x 100
Subtract the new number by the original number
721 - 171 = 550
550 ÷ 171 = 3.216374269005848
3.216374269005848 x 100 = 321.64%