Service level agreement

Dear All, A service level agreement is executed, for a consideration of Rs.20,000 p.m and period of agreement is for 5 years. Then in such a case what would be the Stamp Duty of such agreement. Place of parties and execution is in Mumbai. So Bombay Stamp Act would apply as per my knowledge. All the help would be valuable. Would the consideration for the sake of agreement be 12 lakhs (20,000*12 months*5 years) ?