For under $20, let the true Excel experts show you how to master Microsoft's popular software

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When you’re talking business numbers, that conversation usually starts with Microsoft Excel. Whether you’re a little hazy on the world’s premier spreadsheet and data analysis tool or even just trying to figure it out for the first time, The Complete Excel Pro Tip Certification Bundle ($19, over 90 percent off from TNW Deals) serves as a comprehensive insider’s guide.