Custom Tailored Shirts is a specialty retailer offering T-shirts, sweatshirts, and caps. Its most recent annual sales consisted of $21,000 of T-shirts, $18,000 of sweatshirts, and $2,900 of caps. The company is adding polo shirts to the lineup and projects that this addition will result in sales next year of $18,000 of T-shirts, $16,000 of sweatshirts, $11,500 of Polo shirts, and $2,100 of caps. What sales amount should be used when evaluating the Polo shirt project?
A) $11,500
B) $5,700
C) $5,000
D) $6,100
E) $4,900