-97.74% is the change from 310 to 7
Calculation steps:
[( 7 - 310 ) ÷ 310] x 100 = -97.74%
Formula
Percentage change = [(7 - 310) / 310] x 100
Subtract the new number by the original number
7 - 310 = -303
-303 ÷ 310 = -0.9774193548387097
-0.9774193548387097 x 100 = -97.74%