-73.23% is the change from 310 to 83
Calculation steps:
[( 83 - 310 ) ÷ 310] x 100 = -73.23%
Formula
Percentage change = [(83 - 310) / 310] x 100
Subtract the new number by the original number
83 - 310 = -227
-227 ÷ 310 = -0.7322580645161291
-0.7322580645161291 x 100 = -73.23%