17.5% is the change from 400 to 470
Calculation steps:
[( 470 - 400 ) ÷ 400] x 100 = 17.5%
Formula
Percentage change = [(470 - 400) / 400] x 100
Subtract the new number by the original number
470 - 400 = 70
70 ÷ 400 = 0.175
0.175 x 100 = 17.5%
Example