QUESTION 15 The following data pertains to activity and costs for two months at PQ Company: Activity level in units Variable costs Fixed costs Mixed costs Total costs July August 4,000 8,000 $16,000? S9,000 S6,000? $31,000 $51,000 Assuming that these activity levels are within the relevant range, the mixed cost for August was: $10,000 $12.000 $1 1,000 D $9,000