<prompt> Translate the following text to EnglishKwa ajili ya fedha za uaminifu isipokuwa fedha za uaminifu revolving na fedha maalum, kama ilivyoelezwa mahali pengine, riba ni kawaida lakini si daima mapato ya non-badilishana.  <response>: For trust funds except trust revolving funds and special funds, as explained elsewhere, the interest is normally but not always a nonexchange revenue. 