Book Maths Puzzle

Sunil purchases two books at Rs.300 each. He sold one book 10% gain and other at 10% loss. What is the total loss or gain in percentage?

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Book Other Question

A train is running at a speed of 40 km/hr and it crosses a post in 18 seconds. What is the length of the train? A reduction of 10% in the price of a pen enabled a trader to purchase 9 more for Rs.540. What is the reduced price of the pen?