Question

A quart of milk costs 73 cents. A case of 12 quarts costs \[\$\]7.68. How much is saved per quart by buying the milk by the case?

Answer 1

Hint: To solve this question, we should find the cost of 1quart of milk by taking the cost of a quart of milk as \[\$\]7.68 and then we should compare it with the cost of one quart which costs 73 cents as per this particular question. Like this we can get the amount that one can save per quart by buying the milk.

Complete step-by-step solution:
To find the cost per quart in a case divide the cost of the case by the 12 quarts in the case giving:
\[\dfrac{\$7.68}{12}=\$0.64\]
To find how much is saved, we should subtract the cost per quart for the case from the cost for a single quart giving:
\[\$0.73-\$0.64=\$0.09\]
Hence from this we can say that,
We can save \[\$\]0.09 or 9 cents per quart by milk by the case versus buying individual bottles.

Note: It is necessary for us to find the cost of each quarts of milk by taking the cost of a quart of milk as \[\$\]7.68, and if we make any mistake in calculation it will lead to the wrong answer. We can also solve this question by multiplying the cost of each quart with 12 and finding the price for case of quart and then we can find the difference for case of quart. Afterwards we can divide this value with 12 to get the savings per quart.