1700% is the change from 18 to 324
Calculation steps:
[( 324 - 18 ) ÷ 18] x 100 = 1700%
Formula
Percentage change = [(324 - 18) / 18] x 100
Subtract the new number by the original number
324 - 18 = 306
306 ÷ 18 = 17
17 x 100 = 1700%
Example