-11.79% is the change from 280 to 247
Calculation steps:
[( 247 - 280 ) ÷ 280] x 100 = -11.79%
Formula
Percentage change = [(247 - 280) / 280] x 100
Subtract the new number by the original number
247 - 280 = -33
-33 ÷ 280 = -0.11785714285714285
-0.11785714285714285 x 100 = -11.79%