A company makes pens. They sell each pen for $7. Their revenue is represented by R(x) = 7x. The cost to make the pens is $1 each with a one time start up cost of $4,500. Their cost is represented by C(x) = x + 4500. Find the profit when the company sells 1000 pens. O $7,000 O $5,500 O -$1,500 O $1,500