18.75% is the change from 336 to 399
Calculation steps:
[( 399 - 336 ) ÷ 336] x 100 = 18.75%
Formula
Percentage change = [(399 - 336) / 336] x 100
Subtract the new number by the original number
399 - 336 = 63
63 ÷ 336 = 0.1875
0.1875 x 100 = 18.75%
Example