Tabular multiply by 24?

Dear Candidate,

The 24 refer to 24 hours in a day. This sentence, and the one that precedes it ("Some of the steps use the same figures for each group such as hours in a day and this makes the maths more time-consuming. An alternative would be to move into an issue tree at this point meaning you only have to multiply by 24 once."), refer to the fact that an issue tree allows you to do quicker maths than a table (where you would have to repeat the math for each row). An issue tree would allow you to sum up and multiply numbers at the end of the issue tree. 

Do not let the 24 confuse you - they do not seem to refer to the existing example of the issue tree or the table. Instead, the 24 is being used to illustrate that an issue tree can be mathematically simpler than a table. 

For example, if you had the question “how many patients enter US emergency rooms per year”, you could do the following steps in an issue tree:
1. Start with a segmentation by hospital type (e.g., small, medium, and large)
2. Come up with # of hospitals for each segment
3. Apply an hourly intake number per hospital segment (e.g., 1 patient/ hour for a small ER, 2 patients/ hour for a medium ER, and 3 patients/ hour for a large ER)
4. Instead of finding the annual number of ER patients for each hospital type individually (which you would have to do in a table), you can simply add the total patients/ hour across the hospital segments, and multiply that by 24 hours to get the daily number of ER patients, and then by 365 to get the annual number of ER patients. 

Hope this helps!