2140% is the change from 15 to 336
Calculation steps:
[( 336 - 15 ) ÷ 15] x 100 = 2140%
Formula
Percentage change = [(336 - 15) / 15] x 100
Subtract the new number by the original number
336 - 15 = 321
321 ÷ 15 = 21.4
21.4 x 100 = 2140%
Example