Final answer:
The new cost of the conference booking at Hotel Five is a 10% increase over the original cost. If the original cost was C, the new cost is 1.10 x C, reflecting the 10% increase.
Step-by-step explanation:
The student's question involves calculating a percentage increase in cost. We are told that Hotel Five has increased the total charges for a 5-hour conference booking, which includes a buffet dinner for 120 people, by 10%. If we designate C as the original cost of booking the hotel, then the new cost (N) will be C plus the 10% increase of C, which is calculated as:
N = C + (10% of C)
N = C + (0.10 × C)
N = C (1 + 0.10)
N = 1.10 × C
The correct answer is that the booking now costs 10% more than the original cost.