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Apart from the fact that often you cannot use multiple discounts at the same time, they are defined multiplicatively, not additively.

A 20% discount means that the price is reduced by 20% to 80% of its full price.

A 20% discount on top of a 20% discount is 80% of 80% which is 0.8*0.8 of the full price which is 64%.

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12y ago

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