Yeah, it's kilodollars, just written "$100k" rather than "100 k$" conventionally. But it's fairly clear that what's being multiplied is the base currency unit (dollars, euros, whatever). For historical reasons currencies give the units via a symbol before the number, instead of a letter after it: €10, $10, £10.
Depends on the country. Most people in the eurozone use "10 €", not "€10". However, when adding SI prefixes most people would append the prefix to the amount, rather than prepending it to the unit e.g. "100k €".
