2740% is the change from 15 to 426
Calculation steps:
[( 426 - 15 ) ÷ 15] x 100 = 2740%
Formula
Percentage change = [(426 - 15) / 15] x 100
Subtract the new number by the original number
426 - 15 = 411
411 ÷ 15 = 27.4
27.4 x 100 = 2740%
Example