A bank borrows Rs.50 crore from call money market on a daily basis and uses that to give a loan of Rs.30 crore to a AAA rated client (i.e. zero default probability over one year) at a rate of interest 2.50% over call money rate to be reset on a daily basis. The bank may see variation in its net interest income over 10 days in respect of this asset because the transaction is associated with _______