Problem 3: Zhao Co. has fixed costs of $354,000. Its single product sells for $175 per unit, and variable costs are $116 per unit. Compute the level of sales in units needed to produce a target (pretax) income of $118,000. Problem 4: US-Mobile manufactures and sells two products, tablet computers and smartphones, in the ratio of 5:3. Fixed costs are $105,000, and the contribution margin per composite unit is $125. What number of each type of product is sold at the break-even point