Cpt ... i am getting confused in this question....someone please explain it

S draws 2 bills of exchange on 1.1.07 for Rs.30000. The bills of exchange for Rs.30000 is for 2 months and the bill of exchange for Rs.50000 is for 3 months. These bills are accepted by K . On 4.3.07 K request S to renew the first bill with interest at 18% p.a for 2 months. S agrees to this proposal. On 20.3.07 K retires the acceptance for Rs. 50000 the interest rebate I.e. discount charges being Rs.500. Before the due date of the renewed bill K becomes insolvent and only 60 Paisa in a rupee can be recovered from his estate . How much bad debt will be recorded in the books of X: A. Rs.75000 B. Rs.147000 C. Rs.152000 D. nil