-80.32% is the change from 310 to 61
Calculation steps:
[( 61 - 310 ) ÷ 310] x 100 = -80.32%
Formula
Percentage change = [(61 - 310) / 310] x 100
Subtract the new number by the original number
61 - 310 = -249
-249 ÷ 310 = -0.8032258064516129
-0.8032258064516129 x 100 = -80.32%