QuantumEdge Manufacturing's contribution format income statement for the most recent month is shown below for $10,000$

sales units.

What would be the revised net operating income per month if the sales volume decreases by $500$ units?

Note: Please be sure to adhere to the instructions for numerical responses. If your response reflects negative net operating

income $($i$.$e$.,$ loss$),$ please include a minus sign before the number. For instance, if NOI is $-$$$100,$ kindly enter it as $-100\mathrm{.}00$