A magazine publisher has a fixed amount of monthly production cost. If each month, he sells $600$ copies of the magazine, his monthly profit is $\$4800$ and if he sells $450$ copies his monthly profit is $\$2550$. What are the publisher's monthly production cost ?

Question

$(a) \;\$4000 \\ (b)\;\$4200 \\ (c)\;\$4500 \\ (d)\;\$4800$