The marked price of a watch was Rs. 720. A man bought the same for Rs. 550.80, after getting two successive discounts, the first 10%. What was the second discount rate ?

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A. 12%
B. 14%
C. 15%
D. 18%

C. 15%

Market price of a watch = Rs. 720

After 1st discount = 90% of 720
After 1st discount = 90/100×720
After 1st discount = Rs. 648

Cost price of watch = Rs. 550.80

Difference = 648 – 550.80
Difference = Rs. 97.20

2nd discount = (97.20/648)×100
2nd discount = 9720/648
2nd discount = 15%

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