To determine how much rent tenant Jones is entitled to as a refund, we need to calculate the number of days he paid for, which he did not occupy the apartment, after moving out on June 7.
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Total Rent for June: $900 for the month.
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Daily Rent Calculation: \[ \text{Daily Rent} = \frac{\text{Total Rent}}{30} = \frac{900}{30} = 30 \]
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Days Tenant Jones Occupied the Apartment:
- Jones moved out on June 7.
- Therefore, he occupied the apartment from June 1 to June 7, which is 7 days.
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Days Tenant Jones Paid for but Did Not Occupy:
- From June 8 to June 30, Jones paid for a total of 30 days in June, but occupied it only for 7 days.
- Thus, he is entitled to a refund for the remaining 23 days.
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Refund Calculation: \[ \text{Refund} = \text{Daily Rent} \times \text{Days Not Occupied} = 30 \times 23 = 690 \]
Therefore, tenant Jones will receive a refund of $690 once tenant Smith moves in.