-82.58% is the change from 310 to 54
Calculation steps:
[( 54 - 310 ) ÷ 310] x 100 = -82.58%
Formula
Percentage change = [(54 - 310) / 310] x 100
Subtract the new number by the original number
54 - 310 = -256
-256 ÷ 310 = -0.8258064516129032
-0.8258064516129032 x 100 = -82.58%