Understanding Cost Behaviour and Contribution Margin $[$LO$1-$ CC$1,3$; LO$3-$ CC$12]$

Murugan Ltd$.$ had the following results for the year:

Sales $$45,000$

Less: Operating expenses $39\mathrm{.}000$

Net operating income $$6\mathrm{.}000$

The average selling price for the units sold was $$15$ per unit and average variable cost $$9$ per unit.

Required:

Prepare a contribution margin income statement.