Link BD consists of a single bar 30 mm wide and 12 mm thick. Knowing that each pin has a10 mm diameter, determine the maximum value of the average normal stress in the link BD if θ = 15 degrees.

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 1. What is the break-even point in sales for product A, B, and C?

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First calculate the weighted average contribution margin ratio for the product mix.

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Calculate the contribution margin ratio per unit for each product individually:

contribution margin ratio = Contribution margin per units / Selling price of each units

Product	A	B	C
Contribution margin per units	6	3	3
Selling price of each units	8	5	4
contribution margin ratio	6 / 8 =0.75	3 / 5 =0.60	3/4 =0.75

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Divide the fixed costs by the contribution margin ratio to calculate the break-even sales for three products:

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Break-even point in sales revenue = Fixed cost / contribution margin ratio

Break-even point in sales units = Fixed cost / contribution margin per units

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Product	A	B	C
Fixed cost	4000	7000	1000
Contribution margin ratio	0.75	0.60	0.75
Contribution margin per units	6	3	3
Break-even sales revenue	$ 5333	$ 11667	$ 1333
Break-even point in sales units	667	2333	333

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2. What is the total profit given the sales mix in the table?

Total contribution - fixed cost = profit

	Product A	Product B	Product C	Total
Contribution (units * Contribution per units )	600*6 =3600	4000*3 =12000	400*3 =1200	$16800
Fixed cost	4000	7000	1000	$12000
Total Profit				$4800