Micromedia offers computer training seminars on a variety of topics. In the seminars, each student works at a PC$,$ practising the skill that the instructor has presented. Micromedia is planning a two$-$day seminar on the use of Microsoft Excel for BQUA$2812.$ The projected fee for the seminar is $$300$ per student. The cost of the conference room, instructor compensation, lab assistants and promotion is $$4800.$ Micromedia rents computers for its seminars at a cost of $$30$ per day. Let $x$ be the number of students who enroll in the seminar.