The UAW puts it at 5-8%. Other sources put it higher, up to about 15%. But that's for combustion vehicles -- most sources put the labor component of EV's at 40-60% of that of combustion vehicles.
It generally includes the labor for sub-assemblies, but not for components. Components are sourced globally, so manufacturers in different countries should not be paying substantially different prices for components. Certainly sometimes they do, but that's generally a tariff issue, not a labor issue.
Not an expert, this is just based on most of an hour of random Googling.
A high school teacher once told me that the most expensive part of a car is healthcare and pension costs. Road and Track reported on this a little while ago, no idea what the situation is today.
It generally includes the labor for sub-assemblies, but not for components. Components are sourced globally, so manufacturers in different countries should not be paying substantially different prices for components. Certainly sometimes they do, but that's generally a tariff issue, not a labor issue.
Not an expert, this is just based on most of an hour of random Googling.