1700% is the change from 20 to 360
Calculation steps:
[( 360 - 20 ) ÷ 20] x 100 = 1700%
Formula
Percentage change = [(360 - 20) / 20] x 100
Subtract the new number by the original number
360 - 20 = 340
340 ÷ 20 = 17
17 x 100 = 1700%
Example