GATE Electrical Engineering (EE) 2022 Solved Paper

The price of an item is 10% cheaper in an online store S compared to the price at another online store M. Store S charges ₹ 150 for delivery. There are no delivery charges for orders from the store M. A person bought the item from the store S and saved ₹ 100.
What is the price of the item at the online store S (in ₹) if there are no other charges than what is described above?