-19.26% is the change from 270 to 218
Calculation steps:
[( 218 - 270 ) ÷ 270] x 100 = -19.26%
Formula
Percentage change = [(218 - 270) / 270] x 100
Subtract the new number by the original number
218 - 270 = -52
-52 ÷ 270 = -0.1925925925925926
-0.1925925925925926 x 100 = -19.26%