52.5% is the change from 400 to 610
Calculation steps:
[( 610 - 400 ) ÷ 400] x 100 = 52.5%
Formula
Percentage change = [(610 - 400) / 400] x 100
Subtract the new number by the original number
610 - 400 = 210
210 ÷ 400 = 0.525
0.525 x 100 = 52.5%
Example