Determine the missing amounts. Unit Selling Price Unit Variable Costs Unit Contribution Margin 1 $300 $279 $ (a) 2 $600 (c) $258 3 $ 2300 (e) $ () $360 Unit Variable Costs Unit Contribution Margin Contribution Margin Ratio $279 $ (a) % (b) (c) $258 % (d) $360 30 %