At an activity level of 9,300 machine-hours in a month, Perry Corporation's total variable production engineering cost is $839,790 and its total fixed production engineering cost is $237,820. What would be the total production engineering cost per machine-hour, both fixed and variable, at an activity level of 9,400 machine-hours in a month? Assume that this level of activity is within the relevant range. (Round intermediate calculations to 2 decimal places.)

a.$116.71

b.$115.78

c.$115.60

d.$115.25