A partial listing of costs incurred during December at Rooks Corporation appears below: Factory supplies Administrative wages and salaries .... Direct materials.... Sales staff salaries.. Factory depreciation Corporate headquarters building rent... Indirect labor ...... Marketing .......... Direct labor... $7,000 $92,000 $176,000 $32,000 $52,000 $47,000 $23,000 $136,000 $82,000 The total of the product costs listed above for December is $340,000 $82,000 $647,000 $307,000 QUESTION 7 If the level of activity increases within the relevant range: variable cost per unit and total fixed costs also increase fived cost ner unit and total variable cost also increase