My friend asked me for help on a math problem, but I’m at a loss. Could anyone maybe help me out?

2 people work out together at a gym and they pay 249 each, together they pay 498. They’ve worked out together for 3 months, in other words the payment should be 498 x 3 = 1494. But they payed 1524, why is that? The payment should be 1494.
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