13.75% is the change from 400 to 455
Calculation steps:
[( 455 - 400 ) ÷ 400] x 100 = 13.75%
Formula
Percentage change = [(455 - 400) / 400] x 100
Subtract the new number by the original number
455 - 400 = 55
55 ÷ 400 = 0.1375
0.1375 x 100 = 13.75%
Example