2580% is the change from 15 to 402
Calculation steps:
[( 402 - 15 ) ÷ 15] x 100 = 2580%
Formula
Percentage change = [(402 - 15) / 15] x 100
Subtract the new number by the original number
402 - 15 = 387
387 ÷ 15 = 25.8
25.8 x 100 = 2580%
Example