The demand function for an electronics company's laptop computer line is p=2400-6q, where p is the price (in dollars) per unit when q units are demanded (per week) by consumers. The variable cost per unit is $500. What is the demand function for the company's laptop computer line?
A) p=2400-6q
B) p=6q-2400
C) p=500q-2400
D) p=2400+6q