320% is the change from 15 to 63
Calculation steps:
[( 63 - 15 ) ÷ 15] x 100 = 320%
Formula
Percentage change = [(63 - 15) / 15] x 100
Subtract the new number by the original number
63 - 15 = 48
48 ÷ 15 = 3.2
3.2 x 100 = 320%
Example