For every shop I have done, the reimbursement stated was for the total amount reimbursed, if I spent that much. Usually if the shop at a restaurant requires you to bring a guest, the amount of reimbursements is enough to cover their meal too. If the shop instructions say you can but not required to bring guests, the reimbursement amount usually covers just one meal. I like to go to the website for the restaurant and check what the prices are for the food before I apply for a shop at a new restaurant.
To be sure about the question, you should clarify with the scheduler. Market force has a link on the home page after you login to email the helpdesk. Have you tried this?
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Two wrongs don't make a right, but three lefts do.