400% is the change from 17 to 85
Calculation steps:
[( 85 - 17 ) ÷ 17] x 100 = 400%
Formula
Percentage change = [(85 - 17) / 17] x 100
Subtract the new number by the original number
85 - 17 = 68
68 ÷ 17 = 4
4 x 100 = 400%
Example