-13.55% is the change from 310 to 268
Calculation steps:
[( 268 - 310 ) ÷ 310] x 100 = -13.55%
Formula
Percentage change = [(268 - 310) / 310] x 100
Subtract the new number by the original number
268 - 310 = -42
-42 ÷ 310 = -0.13548387096774195
-0.13548387096774195 x 100 = -13.55%