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It was a combination of civilisations. We use the Indo-Arabic system.
It is mainly because humans have ten digits: fingers and thumbs. As a result, from prehistoric times, one of our counting bases has been ten.
2/10 as a decimal is 0.2
Numbers as we know today are the numbers of the decimal system (0, 1, 2, 3, 4, 5, 6, 7, 8, and 9). They were created by mathematicians in ancient India s invented the decimal system around in the 9th century CE. This numerical system was later adopted by Persian and Arabic mathematicians and spread to the western world by the High Middle Ages.
Not in the way we that would use a decimal point today. But they did use points to signify fractions of 12.