The marked price of every item being sold by a wholesaler was ₹400. The wholesaler was offering a stock-clearance sale, under which for every four items paid for, one item was being given free. In addition to that, a further 5% discount on the amount payable on the ‘Buy 4, Get 1 free’ scheme price was being offered to anyone making purchases worth more than ₹15,000. Rameshwar made purchases for which the amount payable, before applying the 5% discount, was ₹16,000. What was the effective discount percentage that was finally offered to Rameshwar during this transaction?