Under Widget Company's cafeteria plan, all full-time employees are allowed to select any combination of the following benefits, but the total received by each employee cannot exceed $8,000 a year. II. III. IV. Group medical and hospitalization insurance for the employee, $3,600 a year. Group medical and hospitalization insurance for the employee's spouse and children, $1,200 a year. Child care payments, actual cost but not more than $3,500 a year. Cash required to bring the total of benefits and cash to $8,000. If Mary selects choices I and III and $900 cash, how much must Mary include in her taxable gross income?