The problem in interest isn't just the higher price. The most important problem with interest is that the price is unknown.
Under Islam, all contracts must have a known and decided exchange agreement, and there cannot be an aspect of the unknown in it.
So, there is nothing inherently wrong if you say that you will pay a total of 110,000 over 6 months ...
Praise be to Allaah.
What we understand from the question is that the bank sells its share of the house to you, and the price is divided into monthly instalments. But at the same time the bank retains its ownership of the house until the instalments are paid off, and during that period it rents its share of the house to you.
Based on that, you pay a ...