15.99% is the change from 344 to 399
Calculation steps:
[( 399 - 344 ) ÷ 344] x 100 = 15.99%
Formula
Percentage change = [(399 - 344) / 344] x 100
Subtract the new number by the original number
399 - 344 = 55
55 ÷ 344 = 0.15988372093023256
0.15988372093023256 x 100 = 15.99%