-11.67% is the change from 317 to 280
Calculation steps:
[( 280 - 317 ) ÷ 317] x 100 = -11.67%
Formula
Percentage change = [(280 - 317) / 317] x 100
Subtract the new number by the original number
280 - 317 = -37
-37 ÷ 317 = -0.1167192429022082
-0.1167192429022082 x 100 = -11.67%