Each burger sells for $ $8.$ 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

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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 $50\%$ 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:

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$)$