$27.00 is the monthly supplement premium
My medigap starts at about $120 per person for K here since you can’t get F anymore unless you are grandfathered.
Per person
A - zero
B - $145 to $500 depending on AGI
D - $13.20 to $130 again depending on AGI
K - $23 to $130
Point is, B and D are progressive, that is socialism of course.