-6.57% is the change from 289 to 270
Calculation steps:
[( 270 - 289 ) ÷ 289] x 100 = -6.57%
Formula
Percentage change = [(270 - 289) / 289] x 100
Subtract the new number by the original number
270 - 289 = -19
-19 ÷ 289 = -0.0657439446366782
-0.0657439446366782 x 100 = -6.57%