<prompt> Translate the following text to EnglishKwa mfano, kwa njia ya posta, faida ya kila siku ya njia za utoaji wa makazi inahesabiwa kwa kuongeza mapato ya jumla ya gharama za ukusanyaji, usindikaji na usafirishaji wa barua zilizotolewa kwenye kila njia na kuondoa gharama ya utoaji ya 266.  <response>: We calculate the daily profit of residential delivery routes for the Postal Service by totaling the revenue minus collection, processing and transportation costs of the mail delivered on each route and subtracting the delivery cost of 266. 