Ravi went to a wholesale dealer to buy boxes of chocolates where he found that each box containing 10 chocolates was listed at the price of 9 chocolates. Added to that, upon buying 15 such boxes, one additional box of chocolates was given free of cost. Ravi buys the 16 boxes of chocolates and sells each of them at the actual list price. Find the percentage of profit made by Ravi in the bargain.
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