Respuesta :

Step-by-step explanation:

Let \( \text{Cost Price (CP)} \) be the cost price of the tube light.

The selling price (\( \text{Selling Price (SP)} \)) is given by the formula:

\[ SP = CP + \text{Profit} \]

In this case, the profit is 20% of the cost price:

\[ \text{Profit} = 0.20 \times CP \]

The selling price is given as Rs 240:

\[ 240 = CP + 0.20 \times CP \]

Now, solve for \( CP \):

\[ 1.20 \times CP = 240 \]

\[ CP = \frac{240}{1.20} \]

\[ CP = 200 \]

Therefore, the cost price of the tube light is Rs 200.

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