21.99% is the change from 391 to 477
Calculation steps:
[( 477 - 391 ) ÷ 391] x 100 = 21.99%
Formula
Percentage change = [(477 - 391) / 391] x 100
Subtract the new number by the original number
477 - 391 = 86
86 ÷ 391 = 0.21994884910485935
0.21994884910485935 x 100 = 21.99%