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A merchant marks up the price of his goods by 40% more than the cost price. He then sells 1/5th of his goods at a discount of 10%, half of the goods at the marked price and the rest of the goods at a discount of 20%. Find his profit percentage.
(a) 25.5%
(b) 28.8%
(c) 27.7%
(d) 26.6%