Required: 1 Assuming that royalties are a semi variable cost, classify each of the ether four costs listed above in terms of their behavior as variable; stepvariabler committed xed. discretionary fixed; stepxed; or semivariable. Show calculations to support your answers for mining labour costs. 2 Calculate the total cost for next February when 1650 tonnes of ore are expected to be extracted. 3 Comment on the cost effectiveness of hauling 1501:) tonnes with respect to DML's truclcingi'hauling cost. Can the company's cost effectiveness be improved? How? 4 Distinguish between committed and discretionary xed costs. If DML were to experience severe