1200% is the change from 17 to 221
Calculation steps:
[( 221 - 17 ) ÷ 17] x 100 = 1200%
Formula
Percentage change = [(221 - 17) / 17] x 100
Subtract the new number by the original number
221 - 17 = 204
204 ÷ 17 = 12
12 x 100 = 1200%
Example