Pls Help

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!