A shopkeeper offers three types of discount schemes for buyers. Which of them has
the maximum discount percentage?
I. Two successive discounts of 10% each.
II. Successive discounts of 15% and 5%.
III. 20% discount.

Given: ​

1.Two successive discounts of 10% 

2. two successive discount of 15% and 5% 

3. discount of 20%.

for discount we use x and y with negative sign.

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