The angle of elevation of the top of a pillar from the foot and the top of a building 20 m high, are 60° and 30° respectively. The height of the pillar is
The Chief Minister of which state was, in October 2017, honoured with the Golden Peacock Award under the category 'Global Leadership in Public Service and Economic Transformation?
A shop keeper earns a profit of 12% on selling a book at 10% discount on the printed price. The ratio of cost price to the printed price of the book is