XYZ Inc. sells a single product for $$30$ per unit. Variable production costs are $$18$ per unit. Fixed overhead costs amount $$20,000$ per month. Variable selling costs are $$3$ per unit. Fixed selling costs are $$4,000$ per month. Last month, the company produced $10,000$ units and sold $9,000$ units. What is the company's margin of safety?

a$.$ $$20,000$

b$.$ $$190,000$

c$.$ $$100,000$

d$.$ $$40,000$