The Average Daily Rate ratio, often used by outsiders as an evaluation of how much revenue is earned each day, is usually calculated on the basis of how many days? 

A. 365 days 
B. 30 days 
C. Number of days a child care facility is open 
D. 360 days 

A.

I meant D.

If your book says 360 days, then you're right.

Ok thank you

To find the answer to this question, we need to understand how the Average Daily Rate ratio is calculated. The Average Daily Rate (ADR) refers to the average revenue earned per room per day. It is usually calculated by dividing the total revenue for a given period by the number of days in that period.

In this case, we are looking for the basis on which the Average Daily Rate ratio is calculated. Considering the options provided, we can eliminate C, as it specifically mentions the number of days a child care facility is open, which may not be applicable to all scenarios.

Next, we can eliminate A and D by looking at the number of days mentioned. Both options mention 365 and 360 days, which are the total number of days in a year but may not always reflect the actual operational days for a business. Therefore, it is unlikely that the Average Daily Rate ratio would be calculated based on these options.

This leaves us with option B, which mentions 30 days. This seems to be the most reasonable option, as it represents a shorter period that is commonly used for measuring averages in business and finance.

Therefore, the correct answer is B.