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?
+349 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!
