To gain 25% after allowing a discount of 10%, the shopkeeper must mark the price of the article which costs him ₹360 as:
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Profit is calculated on cost price, while discount is applied to the marked price. Use the formula: \( \text{Selling Price} = \text{Marked Price} \times (1 - \text{Discount}) \).
Let the marked price be \( x \).
Selling price after 10% discount = \( 0.9x \).
To gain 25%, the selling price should be \( 1.25 \times 360 = 450 \).
Thus, \( 0.9x = 450 \).
Solving for \( x \):
\[
x = \frac{450}{0.9} = 500
\]
Thus, the required marked price is ₹500.