MTF interest calculation query

Lets say if i bought stock worth 3 lakh with my 1 lakh INR with MTF and hold it for 1 year.

Therefore interest would be around 40 x 2 x 365

because it is 40 ruppees per lakh and I have borrowed 2 lakh for above purchase.

Now say after 1 year if the stock appreciates and now it’s worth 6 lakh.

How would the interest be calculated ? Will it be same as the previous year or will it be on the new value ?

Interest will be charged only on the amount you borrowed (₹2 lakh), not on any appreciation in your stock holdings.
So, even if you hold your position for a year and your shares double or triple in value, you’ll still pay ₹29,200 as interest regardless of how much your shares grow.