45.25% is the change from 400 to 581
Calculation steps:
[( 581 - 400 ) ÷ 400] x 100 = 45.25%
Formula
Percentage change = [(581 - 400) / 400] x 100
Subtract the new number by the original number
581 - 400 = 181
181 ÷ 400 = 0.4525
0.4525 x 100 = 45.25%