<prompt> Translate the following text to SwahiliThe sensitivity of cost to volume for a postal system can be investigated directly provided the ratio of fixed to variable costs is known by function.  <response>: Uwezo wa gharama kwa kiasi kwa ajili ya mfumo wa posta inaweza kuchunguzwa moja kwa moja zinazotolewa uwiano wa gharama za kudumu kwa kubadilika ni inayojulikana kwa kazi. 