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A single discount % equal to three successive discounts of 30%, 20% and 10%.

49.6%
50.4%
40%
60%
Explanation:

Let the initial price be 100.

30% discount on 100 is 30

(100 - 30) = 70

20% discount on the 70 is 14

(70 - 14) = 56

10%discount on the 56 is 5.6

So the answer is 30 + 14 + 5.6 = 49.6

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