Natalie charges $1,490 per month to rent each of her three rental houses. Natalie must pay $5,850 in maintenance costs per house per year. If all three houses are occupied, how much money will Natalie earn over seven years?

Over seven years, rent from the three houses totals $1,490 × 3 × 12 × 7 = $375,480. Maintenance costs total $5,850 × 3 × 7 = $122,850. Subtracting costs from rent gives $375,480 − $122,850 = $252,630, so the answer is $252,630.

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