The following data pertain to activity and costs for two months: October November Activity level in units 5,000 10,000 Variable costs $10,000 2 Fixed costs 30,000 ? Mixed costs 20,000 ? Total costs $60,000 $75,000 Assuming that these activity levels are within the relevant range, what were the mixed costs for November? 1) $20,000 O2) $25,000 3) $35,000 4) $40,000