In the third part of the FT video series Finance Decoded, Jonathan Guthrie explains how companies calculate their profit, what investors should be wary of and the different measures used to gauge how a company is really performing.<br /><br />► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />For more video content from the Financial Times, visit http://www.FT.com/video<br /><br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes