2480% is the change from 15 to 387
Calculation steps:
[( 387 - 15 ) ÷ 15] x 100 = 2480%
Formula
Percentage change = [(387 - 15) / 15] x 100
Subtract the new number by the original number
387 - 15 = 372
372 ÷ 15 = 24.8
24.8 x 100 = 2480%
Example