# Can somehow help justify if my solutions to the problem below is correct and guide me on (b)?

##### 2 Answers

**The customer must travel** **Km to reduce average cost at #80#cents/kilometer.**

#### Explanation:

b) let x be the asked kilometer for average cost at 80 cents per kilometer. Then

For a distance of

#### Explanation:

The total cost of travelling

To find the average cost per Km:

divide the total cost by the number of Km travelled.

Ave cost =

The average cost for

For a distance of