-10.13% is the change from 306 to 275
Calculation steps:
[( 275 - 306 ) ÷ 306] x 100 = -10.13%
Formula
Percentage change = [(275 - 306) / 306] x 100
Subtract the new number by the original number
275 - 306 = -31
-31 ÷ 306 = -0.10130718954248366
-0.10130718954248366 x 100 = -10.13%