varibles

[Brendhan Horne]

Okay another episode of help the newbie.
In the tutorial this example exists:
>>>tax=17.5/100
>>>price= 3.50
>>>price*tax
0.6125
>>>price+_
4.1125
>>>round(_,2)
4.11

What happens is it is off by .0001
instead I get
0.612499999999993
and the rest of it fall of from there I was wondering do they round it off
in the manual for simplicity sake or is the setup changed with 1.6. There is
also the possibility I screwed up.

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Thanks,
Brendhan