The burrito truck industry in the city is perfectly competitive. On any given evening, the market demand for burritos is given by =68 , where is the quantity of burritos demanded per evening, and is the price of a burrito. Each burrito seller must pay $40 per day to rent a burrito truck. In addition, the cost of ingredients for each burrito is $4, regardless of how many burritos are sold. Given space constraints, each burrito truck is able to serve a maximum of 10 customers per evening. 10th attempt In a long-run equilibrium in the burrito industry, the number of sellers (burrito trucks) in the market every evening will be