The Indian government will offload a stake of about 5% in shipbuilder Cochin Shipyard COCH.NS, an exchange filing showed on Tuesday.The floor price for the sale is 1,540 rupees, an 8% discount to the stock's Tuesday close, the filing showed. At this price, the stake is valued at 20.26 billion rupees ($241.2 million).The base size of the offer will be 2.5%, amounting to about 6.