1800% is the change from 18 to 342
Calculation steps:
[( 342 - 18 ) ÷ 18] x 100 = 1800%
Formula
Percentage change = [(342 - 18) / 18] x 100
Subtract the new number by the original number
342 - 18 = 324
324 ÷ 18 = 18
18 x 100 = 1800%
Example