A study has been conducted to determine if one of the departments in Parry Company should be discontinued. The contribution margin in the department is $$40,000$ per year. Fixed expenses charged to the department are $$65,000$ per year. It is estimated that $$30,000$ of these fixed expenses could be eliminated if the department is discontinued. These data indicate that if the department is discontinued, the company's overall net operating income would:

Oa$.$ decrease by $$15,000$ per year.

Ob$.$ decrease by $$10,000$ per year.

c$.$ increase by $$10,000$ per year.

Od$.$ increase by $$15,000$ per year.