What is The Second Discount Rate ? If

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

  1. 12 %
  2. 18 %
  3. 15 %
  4. 14 %
Anurag Mishra Professor Asked on 12th August 2015 in Maths.
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1 Answer(s)
Best answer

Answer: (3) 15 %

Explanation:-
Let the second discount rate be X %
According to the question,
(100 – X) of 90 % of 720  = 550.80
720 x 90 x (100 – X) / 100 x 100  = 550.80
72 x 9 x (100 – X) / 100 = 550.80
648 x ( 100 – X) = 550.80 x 100
648 x 100 – 648 x X = 55080
– 648 X = 55080 – 64800
– 648 X = – 9720
X = 9720/648
X = 15
Then, the successive discount rate is 15 %.

Hence, the answer is (3) 15 %.

 

Anurag Mishra Professor Answered on 12th August 2015.
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