-29.68% is the change from 310 to 218
Calculation steps:
[( 218 - 310 ) ÷ 310] x 100 = -29.68%
Formula
Percentage change = [(218 - 310) / 310] x 100
Subtract the new number by the original number
218 - 310 = -92
-92 ÷ 310 = -0.2967741935483871
-0.2967741935483871 x 100 = -29.68%