At an activity level of 8,700 machine-hours in a month, Nooner Corporation's total variable production engineering cost is $744,720 and its total fixed production engineering cost is $181,560. What would be the total production engineering cost per unit, both fixed and variable, at an activity level of 8,900 machine-hours in a month? Assume that this level of activity is within the relevant range. (Do not round intermediate calculations.) $106.00 $105.65 $106.18 $105.11