Explanation:
The cost price of the article is R$ 1,760.
To see why, note that the garnic (or markup) is equal to the selling price minus the cost price. In this case, the garnic is R$ 88 - x, where x is the cost price. We also know that the garnic is equal to 1/20 of the cost price, so we have:
R$ 88 - x = x/20
Multiplying both sides by 20, we get:
R$ 1,760 - 20x = x
Solving for x, we find that x = R$ 1,760. Therefore, the cost price of the article is R$ 1,760.