As TDFI makes more bags of dog foodAs TDFI makes more bags of dog food, does the variable cost per unit of dog food increase, decrease, or stay the same? As TDFI makes more bags of dog food, does the variable cost per unit of dog food increase, decrease, or stay the same? Decreases Stays the same Increases, does the average cost per bag of dog food increase, decrease, or stay the same? As TDFI makes more bags of dog food, does the average cost per bag of dog food increase, decrease, or stay the same? Decreases Stays the same Increases