A shopkeeper bought a chair whose marked price is Rs. 800, at two successive discounts of 10% and 15% respectively. He spent Rs. 28 on its transportation and then sold the chair for Rs. 800. What is his gain in percentage?
A. 10 %
B. 20 %
C. 25 %
D. 40 %
A. 10 %
B. 20 %
C. 25 %
D. 40 %
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