Charlie trusts a woman that can't do math

Season four, episode 21, 'Tucked, Taped and Gorgeous'.

Charlie goes to see the arrogant egomaniac this show has for a shrink.

The woman says something about her price being 350 dollars an hour (what an expensive shrink!).

Then later, this same woman, referring to what she said earlier about her being expensive to talk to, mentions 'seven dollars a minute'.

Should I give the reader a minute at this point, or should I finish my point?

According to my calculations, 350 an hour would be 5,33333~ per minute. This woman 'rounds it up' to seven bucks??

Either this show realistically depicts a) shrinks are deceptive, greedy egomaniacs that don't care about the patients or b) women can't do math.

Yes, I said it. But how many math geniuses do you know that belong to the female portion of the population? (I always get populous, populace and population confused, so my apologies if I made a mistake here)

How many women are really actually interested in math? You can probably throw a pebble into a male crowd and hit a few men that are interested in math, but take a same-sized crowd and it's very possible there's not even one single female entity there that has any interest in it.

In any case, this show often brilliantly shows realism that most shows would never dare touch, especially about relationships, women and female psyche.

Yet it's infuriating because Charlie, as dumb as he can be as a character, would never be stupid enough to trust a quack that can't even do basic math!

P.S. Just for closure, seven dollars a minute would be 420 dollars per hour. Did the makers of this show want to include some kind of drug joke?