11.25% is the change from 400 to 445
Calculation steps:
[( 445 - 400 ) ÷ 400] x 100 = 11.25%
Formula
Percentage change = [(445 - 400) / 400] x 100
Subtract the new number by the original number
445 - 400 = 45
45 ÷ 400 = 0.1125
0.1125 x 100 = 11.25%
Example