1211.11% is the change from 18 to 236
Calculation steps:
[( 236 - 18 ) ÷ 18] x 100 = 1211.11%
Formula
Percentage change = [(236 - 18) / 18] x 100
Subtract the new number by the original number
236 - 18 = 218
218 ÷ 18 = 12.11111111111111
12.11111111111111 x 100 = 1211.11%