2200% is the change from 15 to 345
Calculation steps:
[( 345 - 15 ) ÷ 15] x 100 = 2200%
Formula
Percentage change = [(345 - 15) / 15] x 100
Subtract the new number by the original number
345 - 15 = 330
330 ÷ 15 = 22
22 x 100 = 2200%
Example