Bala sold an article for N6900 with a 15% profit. We need to find the profit or loss percentage if he sold it for N6600.

1. Problem Description

Bala sold an article for N6900 with a 15% profit. We need to find the profit or loss percentage if he sold it for N

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2. Solution Steps

First, let's calculate the cost price of the article.

Selling Price = Cost Price + Profit

Profit = 15% of Cost Price

Selling Price = Cost Price + 0.15 * Cost Price

Selling Price = 1.15 * Cost Price

Given that the selling price is N6900, we have:

$6900 = 1.15 * Cost Price$

$Cost Price = \frac{6900}{1.15}$

$Cost Price = 6000$

Now, let's calculate the profit or loss if he sold it for N

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0. New Selling Price = N6600

Profit/Loss = New Selling Price - Cost Price

Profit/Loss = $6600 - 6000 = 600$

Since the result is positive, it's a profit.

Now, we need to find the profit percentage.

Profit Percentage = $\frac{Profit}{Cost Price} * 100$

Profit Percentage = $\frac{600}{6000} * 100$

Profit Percentage = $\frac{1}{10} * 100$

Profit Percentage = $10$%

3. Final Answer

C. profit of 10%