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Amazon.com offers successive discounts ...

Amazon.com offers successive discounts of 30% and 20% on laptops. Its rival, Wal - Mart, offers successive discounts of 10% and 40% on the same laptops. If a laptop is listed at $600 in both the stores , how much does a customer stand to save by choosing one store over the other ?

A

6

B

12

C

18

D

20

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The correct Answer is:
b
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