17.5% is the change from 40 to 47
Calculation steps:
[( 47 - 40 ) ÷ 40] x 100 = 17.5%
Formula
Percentage change = [(47 - 40) / 40] x 100
Subtract the new number by the original number
47 - 40 = 7
7 ÷ 40 = 0.175
0.175 x 100 = 17.5%
Example