I was buying school supplies for my children when I began to wonder if I had enough money with me. I brought $50, but there seemed to be so many things
that I had to buy.  Help me decide if I had enough money.
The calculator cost $25, crayons - $4, 8 notebooks
at $1 each, protractor - $2, 3 packs of pencils at $2 for each pack, and 4 pens at $1 each.
Assume there is no tax.
Show your work.