-98.71% is the change from 310 to 4
Calculation steps:
[( 4 - 310 ) ÷ 310] x 100 = -98.71%
Formula
Percentage change = [(4 - 310) / 310] x 100
Subtract the new number by the original number
4 - 310 = -306
-306 ÷ 310 = -0.9870967741935484
-0.9870967741935484 x 100 = -98.71%