Ahead of public sale of shares Coal India(CIL) plans to hike prices by 11%.The price increase will net CIL an additional revenue of Rs4,629 crore and boost profits ahead of a public offer in the stock market. With the state-run CIL mining 84% of the coal produced in the country, an 11% increase will push up inflation by around 0.16%, the company said. Any increase in prices of coal, a key input for most sectors, will have a cascading effect. Also in a step towards disinvestment, Coal India has got approval from the coal ministry to reduce the face value of its shares to Rs 10 from existing Rs 1,000, a move would increase the number of the company's shares to 631.6 crore. "The coal ministry has given us its approval to lower the face value of our shares from Rs 1,000 a share at present to Rs 10 per share," Coal India Chairman P S Bhattacharyya said