F.2 science easy~plz help

(A)Calculate the amount of energy per 100g of each of the foods above.Put the answer below.

Food,Weight(g),Energy(kJ),Energy(kJ/100g)

1)Butter,250,7800,??
2)Cabbage,600,204,??
3)Apple pie,500,5250,??

4)Chocolate,400,9600,??
5)Milk,1000,2700,??
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If you wants to lose weight,which two of the above food should be avoided?Why?