Profit and loss problems

1. A vendor buys airtime worth $50 and sells it for $56. Find the profit %.
2. A shop buys shoes for $20 and sells them for $17. Find the loss %.
3. A trader wants a 30% profit on goods costing $40. What should the selling price be?
4. Goods sold for $69 made a 15% profit. Find the cost price.

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