Verified Answer :

Lets find the unit rate of both of the shirts.

5 for 63 

4 for 54 

63/5 = 12.60

54/4 = 13.50

Now we have our unit rates!

Greg =   $12.60 per shirt
Zachary =  $13.50 per shirt

Greg's shirt were cheaper than his brothers, so it has a better cost.

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