Book Maths Puzzle

A man buys a colour T.V. for Rs. 16500. For how much should he sell it so as to:
(i)gain 10%
(ii)lose 5% on it.

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Book Other Question

In an examination 80% of examiners passed in English and 70% in mathematics. 10% of examiners failed in both the subjects. If 144 examiners passed in both the subjects, find the total number of examiners. In what time will Rs. 2500 amount to Rs. 3512.32 at 12% p.a.?