71.56% is the change from 320 to 549
Calculation steps:
[( 549 - 320 ) ÷ 320] x 100 = 71.56%
Formula
Percentage change = [(549 - 320) / 320] x 100
Subtract the new number by the original number
549 - 320 = 229
229 ÷ 320 = 0.715625
0.715625 x 100 = 71.56%