20.2% is the change from 391 to 470
Calculation steps:
[( 470 - 391 ) ÷ 391] x 100 = 20.2%
Formula
Percentage change = [(470 - 391) / 391] x 100
Subtract the new number by the original number
470 - 391 = 79
79 ÷ 391 = 0.2020460358056266
0.2020460358056266 x 100 = 20.2%