If selling price is doubled, the profit triples. Find the profit percent.

Let the **Cost Price (C.P.)** be \( x \) and the **Profit (P)** be \( y \). 

1. The **Selling Price (S.P.)** is given by:
   \[
   S.P. = C.P. + P = x + y
   \]
2. The condition says that when the selling price is doubled, the profit triples. So, when the selling price becomes \( 2(x + y) \), the profit becomes \( 3y \). Therefore:
   \[
   2(x + y) = x + 3y
   \]
   
### Solving the equation:
\[
2x + 2y = x + 3y
\]
Simplify:
\[
2x - x = 3y - 2y
\]
\[
x = y
\]
So, the cost price is equal to the original profit, i.e., \( C.P. = P \).

### Profit Percentage:
The profit percent is calculated as:
\[
\text{Profit \%} = \frac{\text{Profit}}{\text{Cost Price}} \times 100 = \frac{y}{x} \times 100 = \frac{x}{x} \times 100 = 100\%
\]

Thus, the profit percent is **100%**.

Would you like further clarification or details?

Here are some related questions to consider:
1. What happens to the profit if the selling price is tripled instead?
2. How do you calculate profit percent if cost price and selling price are known?
3. What is the formula for calculating profit in terms of cost price and selling price?
4. How does a change in cost price affect the profit percent?
5. How is loss percent calculated if the selling price is less than the cost price?

**Tip:** Always ensure you differentiate between profit amount and profit percentage when solving word problems!

Learn how to calculate the profit percent when the selling price is doubled and the profit triples. This problem involves algebraic equations and profit percentage calculations, suitable for Grades 8-10. Follow the step-by-step solution to master these concepts.

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