Final answer:
According to the Negotiable Instruments Act, Abdullah cannot recover the full amount of the cheque, but he can recover a portion of it based on the damage suffered by Murtaza due to the delay.
Step-by-step explanation:
According to the Negotiable Instruments Act, 1881, if a cheque is not presented for payment within a reasonable time, the drawer (Murtaza) will be discharged from liability to the extent of the damage caused by the delay. In this case, Murtaza suffered a damage of Rs. 30,000 because the bank failed to pay due to the delay.
Therefore, Abdullah (the landlord) cannot recover the full amount of Rs. 50,000, but he can recover a portion of it. The exact amount that Abdullah can recover will be determined based on the proof of the damage caused to Murtaza and the relationship between the amount of the cheque and the damage suffered.