1. **Problem:** Calculate how long the bookstore is open each day given it opens at 9:30AM and closes at 5:00PM. 2. **Formula and rules:** To find the total time open, subtract the opening time from the closing time. 3. **Calculation:** - From 9:30AM to 5:00PM is from 9:30 to 17:00 in 24-hour format. - Calculate hours: $$17 - 9 = 8$$ hours. - But since it opens at 9:30, subtract 30 minutes from the total. - Total time open = $$8\text{ hours} - 0.5\text{ hours} = 7.5\text{ hours}$$. 4. **Expressing in hours and minutes:** - $$7.5\text{ hours} = 7\text{ hours } 30\text{ minutes}$$. 5. **Answer:** The bookstore is open for **7 hours and 30 minutes** each day.