Calculating better value products.

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The special promotion tins of 300g cost 0.80$.

The soup can also be bought in larger tin of 500g that cost 1.12$.

Is it better value to buy the 500g tin or the special promotion tin? Show your working.

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$(300,500)=1500$

And:

$5*0.8>3*1.12$

So in general it's better to buy the 500g tin