al fixed costs 9. The following data pertain to activity and costs for two months: June July Activity level in units 10,000 20.000 Variable costs $20,000 Fixed costs 15,009 Mixed costs 10,000 Total costs 545,000 $70,000 Assuming that these activity levels are within the relevant range, what were the mixed costs for July? $15,090 $10,000 $40.000. $35.000