<prompt> Translate the following text to SwahiliOne can easily increase the discount from zero and, for each discount level, calculate several 1 the total revenue lost by the postal service, which is simply equal to the discount level multiplied by the presort volume; 2 the total cost incurred by mailers or by mailing organizations, which is the area under the supply curve; and 3 the total savings of the postal service because it does not have to do the sorting and processing, which is the area under the cost curve.  <response>: Kila kiwango cha punguzo kinaweza kuongezeka kutoka sifuri na, kwa kila kiwango cha punguzo, kuhesabu kiasi cha mapato yaliyopotea na huduma ya posta, ambayo ni sawa na kiwango cha punguzo mara mbili ya kiasi cha kabla ya kuchagua; jumla ya gharama zilizopatikana na wauzaji wa barua au mashirika ya posta, ambayo ni eneo chini ya curve ya usambazaji; na jumla ya akiba ya huduma ya posta kwa sababu haina kufanya utaratibu na usindikaji. 