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# Pls Help

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Which is a better buy — 400 g of biscuits costing $2.98, or a pack of biscuits with 400 g + 25% extra, costing$3.28?

Guest Oct 18, 2017
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Let $$A$$ be the first pack of 400g, and $$B$$ be the second pack of 400g+25%.

First, we calculate the total weight of pack $$B$$ with the 25%:

$$400g*25\%=100g$$

$$400g+100g=500g$$ in total

Then, we calculate the unit price (price per gram) for each pack: $$unitPrice={price\over quantity}$$

A). $${\2.98\over400g}=\0.00745$$

B). $${\3.28\over500g}=\0.00656$$

As we can clearly see, the unit price of $$A$$ is greater than the unit price of $$B$$, therefore pack $$B$$ is a better buy, but only by a fraction of a cent!

Mathhemathh  Oct 18, 2017

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