<prompt> Translate the following text to EnglishKwa kutumia data ya kawaida ya gharama iliyotolewa katika mchakato wa utaratibu wa posta, Sehemu ya 2 ya karatasi hii inalingana na gharama ya utoaji wa vijijini na mijini, Sehemu ya 3 inaonyesha uhusiano wa gharama ya utoaji wa vijijini na wiani wa idadi ya watu, Sehemu ya 4 inachambua faida viz.  <response>: Using routine cost data submitted in the course of postal rate proceedings, Section 2 of this paper compares the cost of rural and urban delivery, Section 3 shows the relationship of rural delivery cost to population density, Section 4 analyzes the profitability viz. 