Asana, an enterprise app that lets people set and track projects and other goals, has hit a goal of its own: today, the company is announcing that it has raised $50 million. The Series C round — led by Y-Combinator's Sam Altman — values the company at $600 million, the company tells me. As a bit of context, Asana last raised $28 million in 2012; that Series B was at a…
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