-68.71% is the change from 310 to 97
Calculation steps:
[( 97 - 310 ) ÷ 310] x 100 = -68.71%
Formula
Percentage change = [(97 - 310) / 310] x 100
Subtract the new number by the original number
97 - 310 = -213
-213 ÷ 310 = -0.6870967741935484
-0.6870967741935484 x 100 = -68.71%