-6.79% is the change from 280 to 261
Calculation steps:
[( 261 - 280 ) ÷ 280] x 100 = -6.79%
Formula
Percentage change = [(261 - 280) / 280] x 100
Subtract the new number by the original number
261 - 280 = -19
-19 ÷ 280 = -0.06785714285714285
-0.06785714285714285 x 100 = -6.79%