37.25% is the change from 400 to 549
Calculation steps:
[( 549 - 400 ) ÷ 400] x 100 = 37.25%
Formula
Percentage change = [(549 - 400) / 400] x 100
Subtract the new number by the original number
549 - 400 = 149
149 ÷ 400 = 0.3725
0.3725 x 100 = 37.25%