A wholesaler marks up the price of a microwave oven by 60% above its cost price. He gives a 15% trade discount to a retailer. The retailer, in turn, marks up the price by 25% above his purchase price and offers a 10% festival discount to the customer. If the customer finally pays ₹14,490 for the microwave, what is the original approximate cost price of the oven to the wholesaler?