37.75% is the change from 400 to 551
Calculation steps:
[( 551 - 400 ) ÷ 400] x 100 = 37.75%
Formula
Percentage change = [(551 - 400) / 400] x 100
Subtract the new number by the original number
551 - 400 = 151
151 ÷ 400 = 0.3775
0.3775 x 100 = 37.75%