3. United Healthcare currently only allows its patients to receive total knee replacements in an inpatient setting. For each total knee replacement, United Healthcare is contracted to pay a flat $30,000 case-rate. The costs of the inpatient encounter are as follow: Fixed Direct Cost Fixed Indirect Cost Variable Direct Cost Variable Indirect Cost $4,500 $6,600 $8,125 $1,150 a. What is the operating income (profit) and margin for each United Healthcare total knee replacement inpatient case?