One of Gelson's new every day, essential grocery items is avocadoes, which are priced at $1 (compared with an average price of $2.10 nationwide at other retailers) regardless of the cost of purchasing the avocados from farms and distributors. Assuming, the average cost of an avocado is $0.75, what is the annual margin of a customer who purchases, on average, 2 avocadoes per shopping trip, and shops at Gelson's 26 times per year?