At an activity level of 9,200 machine-hours in a month, Nooner Corporation's total variable production engineering cost is $767,300 and its total fixed production engineering cost is $154,008. What would be the total production engineering cost per unit, both fixed and variable, at an activity level of 9,300 machine-hours in a month? Assume that this level of activity is within the relevant range. a. $98.42 b. $99.31 c. $98.96 d. $99.96 e. $97.54