Given the cost formula Y = $15,700 + $4x, at what level of activity will total cost be $42,500? * 7,000 units 6,700 units 6,250 units 6,925 units 6:03 PM A company has provided the following data: * Sales 3,000 units Sales price S70 per unit Variable cost S50 per unit Fixed cost $25,000 If the dollar contribution margin per unit is decreased by 10%, total fixed cost is decreased by 20%, and all other factors remain the same, what will the outcome be for operating income? Decrease by $11,000 Decrease by $1,000 Increase by $1,000 O Increase by $11,000 A company presented the following data related to activity and costs for two months: * Activity level in units Variable costs Fixed costs Mixed costs Total costs October 5,000 $10,000 30,000 20,000 $60,000 November 7,500 ? ? ? $75,000 Assuming that these activity levels are within the relevant range, what were the mixed costs for November? $15,000 O $25,000 $20,000 O $30,000