CST$-59526$ restaurant produces and sells hamburgers. Each burger sells for $ $9.$ During December, the restaurant sold $10,000$ burgers $($the average amount sold each month$).$ The restaurant employs cooks, servers, and one supervisor $($the owner, Carol Johnson$).$ All cooks and servers are part$-$time employees. The restaurant maintains a pool of part$-$time employees so that the number of employees scheduled can be adjusted to the changes in demand.

A janitor is hired to clean the building on a weekly basis. The building is leased from a local real estate company. The building has no seating capabilities. All orders are filled on a drive$-$through basis.

The supervisor spends $40\%$ of her time supervising food production, and the balance of her time supervising counter staff and on various other sales and administrative activities. The following costs were incurred during December:

Hamburger Meat $ $5,000$

Lettuce $ $1,800$

Tomatoes $ $1,100$

Buns $ $1,100$

Cook's wages $ $11,000$

Server's wages $ $8,000$

Supervisor's salary $ $18,000$

Utilities $ $2,200$

Depreciation $-$ cooking equipment $ $700$

Depreciation $-$ cash register $ $400$

Advertising $ $700$

Rent $ $1,000$

Janitorial expenses $ $400$

Utility costs consist of a $ $1,100$ fixed cost with the balance depending upon usage. How much is the extra profit, if the restaurant sells one more hamburger? $($Please carry out your calculations up to two decimal places$)$

Multiple Choice

$ $4\mathrm{.}47$

$ $6\mathrm{.}09$

$ $6\mathrm{.}99$

$ $5\mathrm{.}37$