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

Let's solve this step by step:

Step 1: Let's assume the cost price of the item is $x$ and the selling price of the item is $y$. So, the profit is $y - x$.

Step 2: According to the problem, if the selling price is doubled, the profit triples. So, the new selling price is $2y$ and the new profit is $3(y - x)$.

Step 3: We can set up the equation from the information given in the problem: $3(y - x) = 2y - x$.

Step 4: Simplify the equation: $3y - 3x = 2y - x$.

Step 5: Rearrange the equation to solve for $y$: $y = 2x$.

Step 6: Substitute $y = 2x$ into the original profit equation: Profit = $2x - x = x$.

Step 7: The profit percent is calculated as (Profit / Cost Price) * 100. So, the profit percent is $(x / x) * 100 = 100$.

So, the profit percent is 100%.