12.5% is the change from 336 to 378
Calculation steps:
[( 378 - 336 ) ÷ 336] x 100 = 12.5%
Formula
Percentage change = [(378 - 336) / 336] x 100
Subtract the new number by the original number
378 - 336 = 42
42 ÷ 336 = 0.125
0.125 x 100 = 12.5%
Example