The normal price for one season pass is $120, but they are currently on sale with a "Buy one, get one half off" offer.
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The price of the first season pass is $120.
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The price of the second season pass, with the half-off deal, is half of $120: \[ \text{Price of second pass} = \frac{120}{2} = 60 \]
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Now, add the prices of both season passes to find the total cost: \[ \text{Total cost} = 120 + 60 = 180 \]
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Since Luis and Faith are splitting the cost evenly, we divide the total cost by 2: \[ \text{Cost per person} = \frac{180}{2} = 90 \]
Thus, Faith owes Luis $90.