subject:business law and taxation

i need the answer quickly in 30 minutes

Q) Asad becomes the guarantor for Saad for the amount which may be given to him by Saeed within 8 months. The maximum limit of the said amount is PKR 500,000. After three months, Asad withdraws his guarantee. It was found at the time of revocation that Saeed had given to Saad PKR 300,000 already. a. Explain if Asad is discharged from his liabilities to Saeed or any subsequent loan. b. If Saad fails to pay PKR 300,000 to Saeed, will Asad be considered liable? Explain