-9.64% is the change from 280 to 253
Calculation steps:
[( 253 - 280 ) ÷ 280] x 100 = -9.64%
Formula
Percentage change = [(253 - 280) / 280] x 100
Subtract the new number by the original number
253 - 280 = -27
-27 ÷ 280 = -0.09642857142857143
-0.09642857142857143 x 100 = -9.64%