I am trying to determine how to calculate breakeven volume and revenue per inpatient day.

Breakeven volume question:

Assume the following costs and revenue data for General Hospital:

Fixed costs= $15 million

Variable cost per inpatient day= $250

Revenue per inpatient day = $1,000

What is the breakeven volume (in patient days)?

The answer is 20,000 but I don't know how this is calculated.

Revenue per in patient day:

Fixed costs= $15 million

Variable cost per inpatient day= $250

What revenue per inpatient day is required to obtain a profit of $1 million at a volume of 25,000 patient days?