I am having a difficult time calculating rates and unit prices. Can someone describe a simple process for using rates and unit prices that will help me understand these concepts?

Question

I searched Google under the key words "rates 'unit prices'" to get these possible sources:

http://www.eduplace.com/math/mathsteps/6/e/
http://72.14.253.104/search?q=cache:cQmNR-NfEBsJ:www.wrightgroup.com/download/em/emgr04un12.pdf+rates+%22unit+prices%22&hl=en&ct=clnk&cd=3&gl=us&client=safari

I hope this helps. Thanksfor asking.