From total sales of $$37,900$ per year, Jennifer earns $$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 $$4,800,$ how much more operating income will she generate from that revenue increase?

Change in operating income

$