3. All Weather Company makes umbrellas and outerwear items for rainy and snowy days. It had the following cost structure for the past year: a. What is the weighted average contribution margin per unit rounded to the nearest cent? b. Assume that the sales mix is quite constant. How many units of each product line are required to break even? c. What are the particular internal and external business risks that the company faces? d. Assume that the company wishes to generate $375,000 of operating income. How many units in total does the company need to produce and sell? e. Assume the company wants to earn a $105,000 target operating income. What sales revenues must be generated? f. Many more umbrellas are sold than clothing. Should more advertising and other efforts be directed toward promoting the clothing lines in an effort to increase the number of units sold