Math Problem for the Week!

Here is a math problem. Try your best to solve it. It is OK if you get the wrong answer, just try it. After a lot of people have given answers, I will tell the answer. I will give a problem every week. This is a very interesting puzzle I saw form a book, so I decided to use it.

In a stationery store, pencils have one price and pens have another price. Two pencils and three pens cost 78 cents. But three pencils and two pens cost 72 cents. How much does one pencil cost?