-20.32% is the change from 310 to 247
Calculation steps:
[( 247 - 310 ) ÷ 310] x 100 = -20.32%
Formula
Percentage change = [(247 - 310) / 310] x 100
Subtract the new number by the original number
247 - 310 = -63
-63 ÷ 310 = -0.2032258064516129
-0.2032258064516129 x 100 = -20.32%