50.25% is the change from 400 to 601
Calculation steps:
[( 601 - 400 ) ÷ 400] x 100 = 50.25%
Formula
Percentage change = [(601 - 400) / 400] x 100
Subtract the new number by the original number
601 - 400 = 201
201 ÷ 400 = 0.5025
0.5025 x 100 = 50.25%