MUMBAI (Reuters) – Indian online classifieds portal Quikr has secured $60 million from backers led by U.S. investor Tiger Global Management LLC to boost product development and expand its mobile business, the company said on Wednesday. Indian online businesses, especially e-retailers, have been a favorite for global investors who are betting on the segment’s growth in a country which already has the world’s third-largest population of Internet users, even though less than a fifth of its 1.3 billion people have access to the web. …