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solve using unitizing. 5 CDs cost $12. How much do 9 CDs cost? What is unitizing. How is it different from unit rate?

I found the answer using unit rate. Not sure what the difference between unit rate and unitizing is. Best I can tell is that unitizing is used mostly in grocery stores. How would this problem be solve with unitizing. Thanks
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12/5=2.4  so 2.40dollars=unit rate
12dollars/5cds=2.40/1cd=unit rate
since it cost 2.40 dollars for 1cd, then 2.40 dollars X 9cds=21.60 dollars for 9cds ;)