7% is the change from 400 to 428
Calculation steps:
[( 428 - 400 ) ÷ 400] x 100 = 7%
Formula
Percentage change = [(428 - 400) / 400] x 100
Subtract the new number by the original number
428 - 400 = 28
28 ÷ 400 = 0.07
0.07 x 100 = 7%
Example