-82.9% is the change from 310 to 53
Calculation steps:
[( 53 - 310 ) ÷ 310] x 100 = -82.9%
Formula
Percentage change = [(53 - 310) / 310] x 100
Subtract the new number by the original number
53 - 310 = -257
-257 ÷ 310 = -0.8290322580645161
-0.8290322580645161 x 100 = -82.9%