Erkkila Inc. reports that at an activity level of 6,400 machine-hours in a month, its total variable inspection cost is $423,680 and its total fixed...

Erkkila Inc. reports that at an activity level of 6,400 machine-hours in a month, its total variable inspection cost is $423,680 and its total fixed inspection cost is $154,368.

What would be the total variable inspection cost at an activity level of 6,700 machine-hours in a month? Assume that this level of activity is within the relevant range.

$423,680

$443,540

$161,604

$578,048