To find the per-day cost of a plan, divide the monthly cost by what number?

To find the per-day cost of a plan, divide the monthly cost by what number?

• A. 29
• B. 30
• C. 28
• D. 31

Answer: (B)

Dividing the monthly cost by the number of days in a typical month gives the daily cost. In many budgeting problems, 30 days is used as the standard month length for simplicity, so you can spread the charge evenly across days. February has 28 or 29 days, and some months have 31 days, but using 30 provides a uniform daily rate. So, the per-day cost is the monthly cost divided by 30.

Dividing the monthly cost by the number of days in a typical month gives the daily cost. In many budgeting problems, 30 days is used as the standard month length for simplicity, so you can spread the charge evenly across days. February has 28 or 29 days, and some months have 31 days, but using 30 provides a uniform daily rate. So, the per-day cost is the monthly cost divided by 30.