<prompt> Translate the following text to EnglishThamani ya sasa ya usafi wakati wa kuuza inahitaji re-thamkia ya gharama ya ruzuku, ambayo ni kutambuliwa kama gharama ya ruzuku au kupunguzwa kwa gharama ya ruzuku.  <response>: The net present value as of the time of sale requires a reestimate of the subsidy expense, which is recognized as a subsidy expense or a reduction in subsidy expense. 