17.79% is the change from 399 to 470
Calculation steps:
[( 470 - 399 ) ÷ 399] x 100 = 17.79%
Formula
Percentage change = [(470 - 399) / 399] x 100
Subtract the new number by the original number
470 - 399 = 71
71 ÷ 399 = 0.17794486215538846
0.17794486215538846 x 100 = 17.79%