Ur rent premises is in Delhi, so that lease agreement is registered at Delhi, with in the juridication of that area, in which rent premises is located.
And Stamp Duty is Rs. 24,100/-, because rent is Rs.1,00,000/- per month and calculation is Rs.1,00,000/- X 12 = 12,00,000/-
Stamp Duty Rs. 2 % of Rs.12,00,000/- = Rs.24,000/- plus Rs.100/- for Security.
for registration of Lease agreement u should have GPA or SPA from the landlord from Mumbai, it should be registered at Munbai.