Flat Rs 150 off on an item marked Rs 1200: effective discount percent

The same question, asked 2 times: 24 Sep 2025 S3, 26 Sep 2025 S2. Every wording below, oldest first.

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Question 1
24 Sep 2025 S3
66 $A shopkeeper offers a festival deal, "Flat Rs. 150 off on every purchase above Rs. 1000." What is the effective discount percentage if a buyer purchases an item marked Rs. 1200?$
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Question 2
26 Sep 2025 S2
64 $An online retailer offers a Rs. 150 discounts on an item originally priced at Rs. 1200. What percentage discount is being offered?$
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