20.77% is the change from 390 to 471
Calculation steps:
[( 471 - 390 ) ÷ 390] x 100 = 20.77%
Formula
Percentage change = [(471 - 390) / 390] x 100
Subtract the new number by the original number
471 - 390 = 81
81 ÷ 390 = 0.2076923076923077
0.2076923076923077 x 100 = 20.77%