If the order weighs x kilograms, then:

Procurement cost =2ax

Logistics cost =6+(x- 1)=x+5.

Total cost =2ax+x+5=(2a+ 1)x+5.

1)

(2a+ 1)x+5 & lt； =38 equals 0

2)

(2a+ 1)x+5 & gt； 38 is x & gt33/(2a+ 1), and the bid price shall not be lower than (2a+ 1)+(5/x).