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Taleb AlDris says
Yes, it is 15%.
Here is the calculation.
720(110%)= 648
He paid 550.8
648550.8=$97.2 second discount
97.2/648=15%

Comment
The marked price of a watch was $ 720. A man bought the same for $. 550.80 after getting two successive discounts, the first being 10%. What was the second rate ? Options (1) 12% (2) 1.4% (3) 15% (4) 18%
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Yes, it is 15%.
Here is the calculation.
720(110%)= 648
He paid 550.8
648550.8=$97.2 second discount
97.2/648=15%