Helena Company manufactures and sells two products. Relevant per unit data concerning each product follow. Compute the contribution margin per machine hour for each product. (Round answers to 0 decimal places, e.g. 5, 275.) If 1, 040 additional machine hours are available, which product should Helena manufacture? Calculate total contribution margin if the additional 1, 040 hours are: (Round intermediate calculation and final answers to 0 decimal places, e.g. 5, 275.) Divided equally between the products. Allocated entirely to the product identified above