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Hint: If we are given a product at cost price equal to x and we are given that we have to sell this at some y % loss then the selling price is given by the formula $x-\dfrac{xy}{100}$. Using this formula, we can solve this question.

__Complete step-by-step answer:__

Before proceeding with the question, we must know the formula that will be required to solve this question.

If we are given a product which is having its cost price equal to x and we are required to sell it at y % loss then its selling price will be given by the formula $x-\dfrac{xy}{100}$. . . . . . . . (1)

In this question, we are given that the cost price for a product is Rs 256. We are required to find the selling price of this product when the loss is 10%.

Substituting x = 256 and y = 10 in the formula (1), we get the selling price of this product equal to,

$\begin{align}

& 256-\dfrac{256\times 10}{100} \\

& \Rightarrow 256-25.6 \\

& \Rightarrow 230.4 \\

\end{align}$

Hence, the selling price of the product is Rs. 230.4.

Note: It is an easy question which can be solved by adequate knowledge of percentage. But since it is an easy question, it is possible that one may commit a mistake while doing the calculations while solving this question in a hurry. For example, there is a possibility that one may write $\dfrac{256\times 10}{100}$ equal to 2.56 instead of 25.6. So, one must be careful while doing these types of calculations.

Before proceeding with the question, we must know the formula that will be required to solve this question.

If we are given a product which is having its cost price equal to x and we are required to sell it at y % loss then its selling price will be given by the formula $x-\dfrac{xy}{100}$. . . . . . . . (1)

In this question, we are given that the cost price for a product is Rs 256. We are required to find the selling price of this product when the loss is 10%.

Substituting x = 256 and y = 10 in the formula (1), we get the selling price of this product equal to,

$\begin{align}

& 256-\dfrac{256\times 10}{100} \\

& \Rightarrow 256-25.6 \\

& \Rightarrow 230.4 \\

\end{align}$

Hence, the selling price of the product is Rs. 230.4.

Note: It is an easy question which can be solved by adequate knowledge of percentage. But since it is an easy question, it is possible that one may commit a mistake while doing the calculations while solving this question in a hurry. For example, there is a possibility that one may write $\dfrac{256\times 10}{100}$ equal to 2.56 instead of 25.6. So, one must be careful while doing these types of calculations.