-94.19% is the change from 310 to 18
Calculation steps:
[( 18 - 310 ) ÷ 310] x 100 = -94.19%
Formula
Percentage change = [(18 - 310) / 310] x 100
Subtract the new number by the original number
18 - 310 = -292
-292 ÷ 310 = -0.9419354838709677
-0.9419354838709677 x 100 = -94.19%