-72.9% is the change from 310 to 84
Calculation steps:
[( 84 - 310 ) ÷ 310] x 100 = -72.9%
Formula
Percentage change = [(84 - 310) / 310] x 100
Subtract the new number by the original number
84 - 310 = -226
-226 ÷ 310 = -0.7290322580645161
-0.7290322580645161 x 100 = -72.9%