A buyer can choose between two payment plans for a product:
Plan X: Pay ₹2000 in the first month and increase the payment by ₹500 every following month.
Plan Y: Pay ₹3500 in the first month and increase the payment by ₹200 every following month.
After how many complete months will the total amount paid under Plan X first exceed the total amount paid under Plan Y?
a) 13
b) 12
c) 11
d) 7