This mythical altMetric utopia requires everyone to actually count in base C (to use dc notation) as well. the main advantage is that thirds and quarters(the useful fractions) tend toward whole numbers. In base 10 all you get are halfs and fifths(and nobody wants to use fifths)

everything would still be metric, the calculations would be as simple, every one would learn their baseC times tables and how to do baseC long division.

$3000 / $(68.49/share) = 54.59B1 shares 54 shares = total cost of $2B88.B6 take your remaining 33.07 and have a nice lunch

1000 Cgrams(1728Agrams) = 1kiloCgram 1000kiloCgrams = 1 Cton

but going smaller a third of a Cgram is 0.4 Cgrams a quarter is 0.3 Cgrams

Does this actually makes any ones life better... Probably not. but it has every advantage of using baseA and the minor(very minor) advantage that thirds and quarters are easier.

But this assumes that baseC won over baseA 1500 years ago, and if there is one truly global success story it is baseA, many languages, cultures, writing systems, but everyone(statisticly) uses baseA with arabic style numbers

footnote: I am using the slightly obnoxious prose of using baseA and baseC to avoid the confusing ambiguity that saying base 10 in base twelve means there are twelve numbers in a digit(where the word digit, coming from the way we count on fingers would also mean twelve.)