21.23% is the change from 391 to 474
Calculation steps:
[( 474 - 391 ) ÷ 391] x 100 = 21.23%
Formula
Percentage change = [(474 - 391) / 391] x 100
Subtract the new number by the original number
474 - 391 = 83
83 ÷ 391 = 0.21227621483375958
0.21227621483375958 x 100 = 21.23%