Oerther Corporation reports that at an activity level of 5,000 units, its total variable cost is $131,750 and its total fixed cost is $31,200. What would be the total variable cost at an activity level of 5,200 units? Assume that this level of activity is within the relevant range. Select one: a. $137,020 b. $131,750 c. $162,950 d. $32,448