The regular price of the hat is $18.20?
Answer:

Step-by-step explanation:
1) if to re-write the given equation into slope-interception form, then:

the slope of the given line is 5/2;
2) according to the rule of perpendicular, the required slope should be:
s*(5/2)=-1;
3) if to solve this equation (s*5/2=-1), then s=-2/5 or -0.4.
Because when you do that ...
-- you're starting with a piece that's less than ' 1 ', and
-- you're calculating a piece of it that's less than the whole original piece.