A shopkeeper allows a discount of 10% to his customers and still gains 20%. Find the marked price of an article which costs Rs 450 to the shopkeeper.

Explanation

To solve the problem step-by-step, we need to find the marked price (MP) of an article that costs Rs. 450 to the shopkeeper, given that he allows a discount of 10% and still makes a profit of 20%.

### Step 1: Understand the given information
- Cost Price (CP) = Rs. 450
- Discount = 10%
- Profit = 20%

### Step 2: Calculate the Selling Price (SP)
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