Ms$.$ K$,$ Ms$.$ O$,$ Mr$.$ F$,$ and Ms$.$ E have decided to partner$-$up and open a caf$.$ They call it:

KOFE Caf$.$

They sell gourmet desserts and coffee. With this being a new business, they pay themselves modestly: each person$$s monthly salary is $$500.$ The store lease is $$1,500$ per month. The utilities total $$300$ per month. The monthly overhead $($i$.$e$.,$ general expenses$)$ and depreciation combined is $$400$ per month.

What are the KOFE Caf$$s monthly fixed costs?

KOFE Caf$$ uses a rather simple yet appealing pricing:

All gourmet desserts are $$3$ each.

Custom$-$roast coffee is $$2$ per $$Grand$$ cup $($the only available size$).$

Amazingly, customers ALWAYS buy one dessert with one Grand$$ coffee. $($What a perfect joint demand!$)$ And, so$,$ the KOFE Caf$$ owners fondly call it the $$KOFE Set.$$

Each KOFE Set sells for $$5(=$ $$3+$ $$2).$

Each KOFE Set costs $$1$ to make.

How many KOFE Sets do they need to sell per month in order to make $$1,200$ in profits per month?