A vendor purchases 6 bananas for Rs. 5. When selling them, he increases the marked price by 50% and offers a 20% discount. What will be the profit percentage of selling 6 dozen bananas?

The vendor marks up the bananas by 50%, making the marked price 150% of the cost price, and then offers a 20% discount. Using the effective selling price formula, the final selling price becomes 80% of the 150% cost price, which equals 120% of the cost price. This produces a profit of 20 percent, making the final result 20%.

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