The two shirts will cost $50 so she can get them pluse something for $10 or less and get 3 things. If she where to buy the jacket she would only have $5 left and can only get 2 things.
2 is better than 1. if she buys the jacket she Will only have $5 left but if she buys both shirts she Will spend $50 and have $10 left to buy whatever else she wants that is less than $10
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