1400% is the change from 17 to 255
Calculation steps:
[( 255 - 17 ) ÷ 17] x 100 = 1400%
Formula
Percentage change = [(255 - 17) / 17] x 100
Subtract the new number by the original number
255 - 17 = 238
238 ÷ 17 = 14
14 x 100 = 1400%
Example