<prompt> Translate the following text to EnglishKamishna wa masuala ya watumiaji wa New York City, Mark Fishbein, alisema: Mara nyingi, maduka ya chakula huongeza malipo ya huduma kwa vyama vikubwa kuliko sita ikiwa mteja anaambiwa mapema, lakini malipo ya ziada ni ya asilimia 15.  <response>: The New York City Consumer Affairs Commissioner is quoted as saying Mr. Fishbein has a shot at winning the suit because restaurants are allowed to add a service charge for parties larger than six if the customer is told in advance--but the surcharge is limited to 15 percent. 