Schemes mixing successive discounts and buy-x-get-y-free: which gives the most discount

The same question, asked 3 times: 18 Jul 2023 S1*, 20 Jul 2023 S2*, 24 Jul 2023 S3. Every wording below, oldest first.

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Question 1
18 Jul 2023 S1
61 $A shopkeeper offers the following two discount schemes. A) Two successive discounts of 10% and 15% B) Buy 5 get 2 free. Which scheme has the maximum discount percentage?$
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Question 2
20 Jul 2023 S2
75 $A shopkeeper offers three schemes as given below to sell a particular type of product. Which of the following schemes offer(s) the maximum discount percentage? A.Buy 6, get 4 free B.Buy 5, get 5 free C. Two successive discounts of 18% and 24%$
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Question 3
24 Jul 2023 S3
53 $A shopping mart offers four different discounts schemes on the sale of an object as follows: (1) A discount of 30% (2) Two successive discounts of 15% (3) Buy 2, get 1 free (4) Buy 5, get 3 free Which discount scheme offers the maximum discount to a customer?$
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Question 1