I spent $12 shopping for school supplies.  I bought a notebook, protractor, calculator, and a box of crayons.  The cost of the notebook was $2 and the protractor was half the price of the notebook.  The calculator was on sale for $6.  What did the box of crayons cost?
Show your work.

For 4th and 5th graders:  If I spent $24 and bought one protractor, one calculator, and one box of crayons (using the price for a box of crayons from above), how many notebooks did I buy?