1550% is the change from 18 to 297
Calculation steps:
[( 297 - 18 ) ÷ 18] x 100 = 1550%
Formula
Percentage change = [(297 - 18) / 18] x 100
Subtract the new number by the original number
297 - 18 = 279
279 ÷ 18 = 15.5
15.5 x 100 = 1550%
Example