HOW DO i FIND THE BEST BUY OF 2 ITEMS?

WHAT IS THE BEST BUY? 3 DISK FOR $20.00 OR 5 DISK FOR $30.00?
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Unit price 1: 20/3=$6.67; unit price 2: 30/5=$6. The second one is cheaper, so is the Best Buy.
by Top Rated User (1.2m points)

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