A person sold a book for Rs 21 and got a loss percentage whi

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A person sold a book for Rs 21 and got a loss percentage which was numerically equal to the cost price. What is the cost price (in Rs) of the book?

[SSC CPO 4 July 2017 Afternoon Shift With Answers]

A 30

B 70,

C Both 30 and 70,

D Cannot be determined,