From total sales of $$28,300$ per year, Maria earns $$5,600$ in operating income from her window cleaning business. Her contribution margin ratio is currently $55\%.$

What are her total variable costs at this volume?

Total variable costs

$

:

What are her fixed costs?

Fixed costs

$

If she is able to increase her total sales by $$5,300,$ how much more operating income will she generate from that revenue increase?

Change in operating income