1400% is the change from 1 to 15
Calculation steps:
[( 15 - 1 ) ÷ 1] x 100 = 1400%
Formula
Percentage change = [(15 - 1) / 1] x 100
Subtract the new number by the original number
15 - 1 = 14
14 ÷ 1 = 14
14 x 100 = 1400%
Example