V.B.Gupta, J.

1. Appellant has filed this appeal challenging the judgment dated 5th August, 1996 passed by Addl. District Judge, Delhi, vide which suit filed by respondent No.1 herein, was decreed for a sum of Rs.31,784.37 together with interest @ 18% per annum, from the date of filing of the suit till realization. Proportionate costs was also awarded in favour of the respondent no.1.

2. The brief facts of this case are that respondent No.1 filed suit for recovery against appellant and respondents 2 to 4. Respondent No.1 is sole proprietor of his firm. Appellant, on credit basis had been purchasing motor parts from respondent no.1 from 8th December, 1974 to 20th May, 1977. Last payment was received by respondent no.1, on 27th April, 1997 for Rs. 3,000/- by cheque and this payment was made by respondent no.3. Goods were also purchased after this date. Appellant and respondent No.3, are sister concern of respondent No.2. Respondent No.3 had been placing orders on behalf of appellant. Respondent No.4 was the workshop manager of appellant and respondents 2 & 3.

3. It had been further alleged that the goods were supplied along with bill and the same were received by th