26.57% is the change from 399 to 505
Calculation steps:
[( 505 - 399 ) ÷ 399] x 100 = 26.57%
Formula
Percentage change = [(505 - 399) / 399] x 100
Subtract the new number by the original number
505 - 399 = 106
106 ÷ 399 = 0.2656641604010025
0.2656641604010025 x 100 = 26.57%