1600% is the change from 18 to 306
Calculation steps:
[( 306 - 18 ) ÷ 18] x 100 = 1600%
Formula
Percentage change = [(306 - 18) / 18] x 100
Subtract the new number by the original number
306 - 18 = 288
288 ÷ 18 = 16
16 x 100 = 1600%
Example