there is a reference to final bills dated 12th November, 1999. It is also an admitted position that neither such bills are produced on record nor any evidence is adduced to show that bills were finalised by the appellant on 12th November, 1999. We have perused the charts annexed to the statement of claim of the respondent filed before the Arbitrator. It records that there were 31 running bills out of which last one was issued on 31st July, 1998. The chart indicates that against the said bill, a sum of Rs.51,35,536/- was paid on 12th November, 1999. The same chart shows that the second last bill was issued on 1st February, 1998 which was cleared in three installments. The last one of which was paid on 31st August, 1998. Therefore, in the chart appended to the statement of claim of the petitioner it is stated that as far as the second last bill of 1st February, 1998 is concerned, the delay was for a period of 13th February, 1998 to 31st January, 1998. The same chart shows that as far as the last bill of 31st July, 1998 is concerned, the period of delay was from 11th August, 1998 till 12th November, 1999. The cause of action for claiming interest arose in case of each bill after expiry of a period of 10 days from the date of the bill. The second last bill dated 1st February, 1998 was in the sum of Rs.66,36,382/- which was paid on 31st August, 1998. Even going by the said chart appended to the statement of claim,