2240% is the change from 15 to 351
Calculation steps:
[( 351 - 15 ) ÷ 15] x 100 = 2240%
Formula
Percentage change = [(351 - 15) / 15] x 100
Subtract the new number by the original number
351 - 15 = 336
336 ÷ 15 = 22.4
22.4 x 100 = 2240%
Example