company's total overhead cost at various levels of activity is presented below:

Month

Machine Hours Total Overhead Cost

March

$5,000$

$ $32,500$

April $4,000$

$ $26,000$

May $6,000$

$ $39,000$

June $9,000$

$ $51,000$

Assume that the overhead cost above consists of utilities, supervisory salaries, and maintenance. The breakdown of these costs at the $4,000$ machine$-$hour level of activity is as follows:

Utilities $($considered variable$)$ $ $12,000$

Supervisory salaries $($considered fixed$)$ $ $4,000$

Maintenance $($considered mixed$)$ $ $10,000$

Total overhead cost $ $26,000$

Suppose the company uses the high$-$low method to estimate a cost formula for mixed costs. What is the total maintenance cost the company expects to incur at an activity level of $6,400$ machine hours?

multiple choice

$$15,600$

$$14,800$

$$15,300$

$$14,400$