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OpenStudy (anonymous):
Front-row tickets for a concert cost $60. After every 5 rows, the ticket price goes down $5. Find the total amount of money made by a full house. There are 20 rows. The first row has 18 seats and each row it increases by 3. I came up with the formula 18 + 3(n - 1) to find out how many seats are in a row. The only problem is that I don't understand how to find the total amount of money made.
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