The 13-year-old who built a best-selling lemonade brand

Mikaila Ulmer's lemonade is now stocked in more than 500 stores across the US, but unfortunately she has slipped to a "C" in her maths class.

Running a successful business is very much a full-time job, but Mikaila - the founder and boss of Me & The Bees Lemonade - also has to make time for her school work.

Just 13 years old, one day she will be in class, the next she could be speaking at an entrepreneurship conference.

"It is not the easiest, that is for sure," she says.

"Sometimes I have to miss classes to do an interview, or travel for a TV show. Or I'll miss a big show or presentation because I have a large project or test at school."

Now selling 360,000 bottles of her lemonade a year, with stockists including upmarket supermarket chain Whole Foods Market, Mikaila is one of the youngest business owners in the US.

Yet while she only recently became a teenager, she has actually been running her Austin, Texas based business since she was four.

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