-9.09% is the change from 297 to 270
Calculation steps:
[( 270 - 297 ) ÷ 297] x 100 = -9.09%
Formula
Percentage change = [(270 - 297) / 297] x 100
Subtract the new number by the original number
270 - 297 = -27
-27 ÷ 297 = -0.09090909090909091
-0.09090909090909091 x 100 = -9.09%