Mr Patrick Smith booked 1 double room for single use from 20 August 2025 (check-in) to 25 August 2025 (check-out) at your hotel.During his stay, he has the following incidental charges:Parking: CHF 10.– per day Spa access: CHF 20.– per night What is the combined total for parking and spa access that should appear on his invoice at check-out?Only write the number, not the CHF

Question

BlackTom AI · Accepted Answer

Number of nights equals checkout date minus check-in date: 25 − 20 = 5 nights.

1) Relevant concepts
- Hotel incidental charges are normally applied per night or per day of the stay. For a booking from 20 Aug (check-in) to 25 Aug (check-out) the guest occupies the room for 5 nights (20→21, 21→22, 22→23, 23→24, 24→25).  
- Multiply the per-day or per-night rate by the number of days/nights to get each subtotal, then add subtotals for the combined total.

2) Step‑by‑step reasoning and calculations
- Calculate number of nights: 25 − 20 = 5 nights.  
- Parking: CHF 10.– per day × 5 days = CHF 10 × 5 = CHF 50.  
- Spa access: CHF 20.– per night × 5 nights = CHF 20 × 5 = CHF 100.  
- Combined total = Parking + Spa = CHF 50 + CHF 100 = CHF 150.

3) Intermediate steps shown (restated)
- Nights = 5  
- Parking subtotal = 10 × 5 = 50  
- Spa subtotal = 20 × 5 = 100  
- Combined = 50 + 100 = 150

4) Why this is correct
- The check-out date is not charged as a further night; charging applies to each night stayed (20th night through the night of the 24th), giving five nights. Both incidental rates are applied for each of those five nights/days, so the arithmetic above yields the correct invoice amount.

5) Common mistakes (why other possible answers would be wrong)
- Counting only 4 nights (e.g., thinking 20→25 is 4) undercharges: that would give 10×4 + 20×4 = 40 + 80 = 120 (incorrect).  
- Using a single-day total like 25 (as shown in the screenshot) misunderstands the per-night/per-day rates; 25 is not the sum over the whole stay.  
- Any answer other than 150 results from miscounting nights or misapplying the per-day/per-night multipliers.

Conclusion: The combined total for parking and spa access is 150, which matches the provided answer.

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