You might just walk away saying Rs.20,000 is too much, I'll come back the next time. No one makes any money.
But at Rs. 3,333 a month, you're like: I can afford that.
1) The manufacturer says ok, if the customer takes this 3,333 per month deal, I'll provide a 5% discount on the product (but not to the customer)
2) The Customer pays 20K, but the financier gives the manufacturer just 19K (5% less)
We will now introduce you to the magic of "cash flow".
What's the interest rate earned by the financier?
But they still don't offer the discount to you yet (which is a violation of RBI rules but no one's seemed to complain yet)
Of course, feel free to ask questions!