No, because successive discounts are taken on the discounted price after the first of the successive discounts. Therefore, 3 successive 5 % discounts will total to a smaller discount than one 15 % discount.
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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%.
no because you don't add the percents together
false
No because after you would take 20% of you have a lower number so the next 20% would be lower too. But if you took 40% off the original number would be bigger so the discount would be bigger.
Not necessarily. It depends on whether the 3% is based on the already discounted price or the original full price: eg original price 100, less 5% = 95. Taking 3% off this is a further 2.85 giving a new nett of 92.15. A straight 8% would leave 92 exactly...