7. A fast-food chain plans to expand by opening several new restaurants. The chain operates two types of restaurants, drive-through and full-service. A drive-through restaurant costs \( \$ 100,000 \) to construct, requires \( 5 \) employees, and has an expected annual revenue of \( \$ 280,000 \) . A full-service restaurant costs 

\( \$ 150,000 \) to construct, requires \( 15 \) employees, and has an expected annual revenue of \( \$ 410,000 \) . The chain has \( \$ 2,100,000 \) in capital available for expansion. Labor contracts require that they hire no more than \( 195 \) employees, and licensing restrictions require that they open no more than \( 18 \) new restaurants. a. If \( x \) drive-through restaurants and \( y \) full-service restaurants are open, write an objective function for the expected revenue. [2 points]