Gut Bombs sandwich shop pays $5,000 a month in rent space and equipment. It pays each of its 10 workers $2,500 a month and spends $5,000 on food. There are no other production costs. Usually the shop sells 3,500 sandwiches per month for $10 each. The shop could hire another worker and increase the number of sandwiches it makes by 300. Assuming a constant food cost per sandwich of $1.43, their marginal cost per month per sandwich, of making 300 more sandwiches per month, rounded to the nearest penny, is Multiple choice question. $7.82. $9.25. $9.76. $8.43.