Hi, I was asked to estimate the no. of hotel rooms in Singapore.
I did: No. of tourists in a day X % staying in hotels / Avg no. of ppl/room
For # of tourists in a day: Typical airport/runway calculation + Home tourists
She said I was extremely off and gave me the no. of tourists in a year - 17 Mil.
After that I did 17 M X 80% (no. who stay in hotel rooms) / 2 (pax per room) / 365
She said it was still off. The answer is 4k...? How should I do this?