Dear Mr. Nasir,
In your calculation, u take 30 days per month. But as per my knowledge, it'll be 26 days per month. "Weekly off"- will not be calculated in this calculation and Overtime rate will be twice of general hourly rate. So, if I'm not wrong actual calculation will be :
OT will be : 9000/(26*8)=43.00X2=Rs.86/hr.