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For this question, first look at the total postage of $18.80 which is only possible for one parcel to be paying $6.80 and the other $ 12.00.

So the two parcels must have  one that is greater than 100 g and less than or equal to  250 g while the other one must be greater than 250 g and less than or equal to 500 g.

So (3) is the answer.

Note: (2) is not the answer as 250g also has postage at $ 6.80.

 

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