A person purchases electronic items worth Rs 2, 50,000. The shop keeper charges him a sales tax of 21% instead of 12%. The purchaser does not realise that he has over paid. But after some time he finds that he has paid excess and asks the shop-keeper to return the excess money. The shop-keeper refuses and the purchaser moves the consumer court. The court with due hearing orders the shop-keeper to pay the purchaser the excess money paid by the way of sales tax, with an interest of 12% per annum. If the whole deliberation takes 8 months, what is the money that the purchaser gets back?