-2.58% is the change from 310 to 302
Calculation steps:
[( 302 - 310 ) ÷ 310] x 100 = -2.58%
Formula
Percentage change = [(302 - 310) / 310] x 100
Subtract the new number by the original number
302 - 310 = -8
-8 ÷ 310 = -0.025806451612903226
-0.025806451612903226 x 100 = -2.58%