-10.65% is the change from 310 to 277
Calculation steps:
[( 277 - 310 ) ÷ 310] x 100 = -10.65%
Formula
Percentage change = [(277 - 310) / 310] x 100
Subtract the new number by the original number
277 - 310 = -33
-33 ÷ 310 = -0.1064516129032258
-0.1064516129032258 x 100 = -10.65%