Investors are betting on new software tools to grapple with one of the thorniest problems in business and life — taxes. Anrok Inc., a startup helping software companies automate sales tax compliance, has raised $55 million in a Series C funding round, more than doubling its valuation to $525 million, the company told Bloomberg. Spark Capital led the round, with participation from Sapphire Ventures, Khosla Ventures, Sequoia Capital and Index Ventures. Anrok’s customers include a number of fast-gr...