41.5% is the change from 400 to 566
Calculation steps:
[( 566 - 400 ) ÷ 400] x 100 = 41.5%
Formula
Percentage change = [(566 - 400) / 400] x 100
Subtract the new number by the original number
566 - 400 = 166
166 ÷ 400 = 0.415
0.415 x 100 = 41.5%
Example