A bookseller sold 300 copies of a book at a profit of 15%. If a book costs
him Rs 12. Find the selling price of the books

To find the selling price of the books, we can follow these steps:

1. **Cost price of one book** = Rs 12
2. **Profit percentage** = 15%

Now, the formula to calculate the selling price of a single book is:

\[
\text{Selling Price} = \text{Cost Price} + \text{Profit}
\]

Since profit is given as a percentage of the cost price, we can express the profit as:

\[
\text{Profit} = \frac{\text{Profit Percentage}}{100} \times \text{Cost Price}
\]

Substitute the values:

\[
\text{Profit} = \frac{15}{100} \times 12 = 1.8 \, \text{Rs}
\]

So, the selling price of one book is:

\[
\text{Selling Price} = 12 + 1.8 = 13.8 \, \text{Rs}
\]

Now, to find the selling price of all 300 books:

\[
\text{Total Selling Price} = 13.8 \times 300 = 4140 \, \text{Rs}
\]

Thus, the total selling price of the 300 books is **Rs 4140**.

Would you like more details on any part of the solution or have any questions?

Here are 5 related questions to explore further:
1. How would the selling price change if the profit percentage increased to 20%?
2. What would be the selling price of 500 books under the same conditions?
3. How can we calculate the total profit made by the bookseller?
4. What if the cost price of each book changed to Rs 15 with the same profit percentage?
5. How does a loss affect the selling price instead of profit?

**Tip:** Always check if you are dealing with profit or loss percentages when calculating selling price.

A bookseller sold 300 copies of a book at a profit of 15%. If a book costs him Rs 12, find the selling price of the books.

Learn how to calculate the selling price of 300 books sold by a bookseller at a 15% profit margin. With a cost price of Rs 12 per book, this problem demonstrates key concepts in profit and percentage calculation. Suitable for students in Grades 6-8.

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