42.5% is the change from 400 to 570
Calculation steps:
[( 570 - 400 ) ÷ 400] x 100 = 42.5%
Formula
Percentage change = [(570 - 400) / 400] x 100
Subtract the new number by the original number
570 - 400 = 170
170 ÷ 400 = 0.425
0.425 x 100 = 42.5%
Example