-10.68% is the change from 309 to 276
Calculation steps:
[( 276 - 309 ) ÷ 309] x 100 = -10.68%
Formula
Percentage change = [(276 - 309) / 309] x 100
Subtract the new number by the original number
276 - 309 = -33
-33 ÷ 309 = -0.10679611650485436
-0.10679611650485436 x 100 = -10.68%