-6.25% is the change from 288 to 270
Calculation steps:
[( 270 - 288 ) ÷ 288] x 100 = -6.25%
Formula
Percentage change = [(270 - 288) / 288] x 100
Subtract the new number by the original number
270 - 288 = -18
-18 ÷ 288 = -0.0625
-0.0625 x 100 = -6.25%