Answer

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**Hint:**We will assume x as the selling price of 10 pens and cost price of 14 pens will also be x. Then, we will find the SP and CP of 1 pen. Then, we will use the fact that gain is equal to selling price minus cost price, i.e. gain= S.P. -C.P. We will use the formula, $gain\%=\dfrac{gain}{C.P}\times 100$ to get the gain%.

**Complete step by step answer:**

Let us take the selling price (S.P.) of 10 pens to be Rs. x.

Now, from this we can say that the S.P. of 1 article is

\[=Rs.\ \dfrac{x}{10}\]

Now, as given in the question, we know that the cost price(C.P.) of 14 pens is also Rs. x.

So, from this, we can get the C.P. of 1 article is

\[=Rs.\ \dfrac{x}{14}\]

Now, the profit made by selling 10 pens can be calculated as follows

Profit=selling price of 10 pens -cost price of 10 pens

Profit=x-10 times the cost price of 1 pens

(As assumed at the start of the question)

\[\begin{align}

& =x-10\times \dfrac{x}{14} \\

& =\dfrac{4x}{10} \\

& =\dfrac{2x}{5} \\

\end{align}\]

Hence, this is the profit that is experienced.

Now, for the profit percent, we can use the formula that is given in the hint as follows

\[\begin{align}

& \Rightarrow profit\%=\dfrac{profit}{C.P.}\times 100 \\

& \Rightarrow profit\%=\dfrac{\dfrac{2x}{5}}{10\times \dfrac{x}{14}}\times 100 \\

& \Rightarrow profit\%=\dfrac{14}{25}\times 100\% \\

& \Rightarrow profit\%=52\% \\

\end{align}\]

**Hence the profit percentage = 52%**

**Note:**Another method of doing this question is that we could simply take the cost price of 1 pen to be Re. 1. Then , we can proceed further as directed in the question and then we can use the formula for finding the profit % to get the final answer which would be the same as this one.

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