Ronaldo bought a computer having marked price $4000. The shopkeeper gave him a discount of 12%. In this transaction the shopkeeper gained 10%. What was the cost price of the computer?

First, calculate the selling price after the discount by subtracting 12% from the marked price of \$4000, which gives \$3520. Since this selling price yields a 10% profit, the cost price equals Selling Price multiplied by 100 divided by the quantity 100 plus the profit percentage. Calculating 3520 times 100 divided by 110 gives a cost price of $3200.

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