280% is the change from 15 to 57
Calculation steps:
[( 57 - 15 ) ÷ 15] x 100 = 280%
Formula
Percentage change = [(57 - 15) / 15] x 100
Subtract the new number by the original number
57 - 15 = 42
42 ÷ 15 = 2.8
2.8 x 100 = 280%
Example