Marked price and selling price given: rate of discount

The same question, asked 3 times: 24 Jul 2023 S2*, 25 Jul 2023 S4*, 9 Sep 2024 S3. Every wording below, oldest first.

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Question 1
24 Jul 2023 S2
70 $The marked price of a mobile phone is ₹15,000 and the shopkeeper sold it for ₹13,500. What is the rate of discount offered by the shopkeeper?$
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Question 2
25 Jul 2023 S4
70 $The marked price of a microwave oven is ₹15,990 and it is sold for ₹12,792. What is the rate of discount offered?$
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Question 3
9 Sep 2024 S3
70 $In a clearance sale, a sari whose marked price was ₹10,490 is now sold for ₹9,441. What is the discount percentage on the sari?$
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Question 1