Deep Discounts in a "Dollar Store"

In the United States, there are "dollar stores." Everything in these stores has a price of one dollar.

Teachers often go to these stores to buy extra school supplies for their students.

For example, a store might sell rulers in a package of 3 for one dollar.

You should beware of really deep discounts, but I saw a sign in a dollar store that was closing: "Everything must go, 75% off!"

So, I bought 4 packages of rulers, indeed the checkout clerk applied the 75% discount to each package, multiplied the discounted price by 4, and added 6.5% sales tax. The rulers were perfectly usable in school: they have centimeters and millimeters on one edge and inches on the other.

To the nearest cent, what was the price of one ruler?


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Answer: IX cents each. Alas, went I returned to the store to buy more, it was closed forever.