Your "big idea" of computer-aided-design for efficient use of space in hospitals has really taken off. You and your partner worked full time during the summer to meet demand for your service, but now you two are due back in classes: a full five courses per semester you need to graduate. You need to hire design professionals to meet demand for your service - but how many?

Here is a table you've developed of the additional revenue your start-up will generate from adding various numbers of design professionals: