-21.94% is the change from 310 to 242
Calculation steps:
[( 242 - 310 ) ÷ 310] x 100 = -21.94%
Formula
Percentage change = [(242 - 310) / 310] x 100
Subtract the new number by the original number
242 - 310 = -68
-68 ÷ 310 = -0.21935483870967742
-0.21935483870967742 x 100 = -21.94%