请教Prep数学

183.
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A certain company charges $6 per package to ship packages weighing less than 2 pounds each.  For a package weighing 2 pounds or more, the company charges an initial fee of $6 plus $2 per pound.  If the company charged $38 to ship a certain package, which of the following was the weight of the package, in pounds?

(A) 16

(B) 17

(C) 19

(D) 20

(E) 22

答案: A

我算算是选B的，想不通A.

(38-6)/2+1=17

哦，我理解成超出1磅后，每磅多收2元...

因为之前很多题目都是有个初始值和超出值，所以惯性思维了

这题则不一样