21.3% is the change from 399 to 484
Calculation steps:
[( 484 - 399 ) ÷ 399] x 100 = 21.3%
Formula
Percentage change = [(484 - 399) / 399] x 100
Subtract the new number by the original number
484 - 399 = 85
85 ÷ 399 = 0.21303258145363407
0.21303258145363407 x 100 = 21.3%