I read a recent article that stated that the average cost for medical
insurance benefits was $9950 for family and $3650 for single
individuals. While bargaining for a better salary, If I decide not to
get the
company medical benefits, what percentage of the total cost can I reasonably
expect to receive as compensation in my salary? For married with
family members as well as single persons.

if you take "salary in lieu" you cannot expect to get the full amount
as yr employer will have to pay payroll taxes on top of whatever they
give you (which would not be payable on the healthcare money)

if you can get 85-90% you'll be doing pretty well

does that answer your question?