your both queries depend upon your present terms and condition of rent agreement which is due for renewal.Please check the caluse for renewal if it says that landlord can increase rent upto 20% then you cannot have legal right for 10%.But if no percentage is mentioned then you can negotiate with the landlord.
Regarding your second point that whether you can stay for two month after expiry or not ..depends upon exit clause in the present agreement. If it says say then you can..otherwise you have no legal right once the notice to vaccate is given by the landlord...
But for the above conditions you can negotiate with the landlord and execute fresh agreement..
16th September 2010 From India , Delhi