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# A company produces and sells two different products. Product A sells f

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Q51  V47
A company produces and sells two different products. Product A sells f [#permalink]
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thinkvision
Statement (1) says that total sales were \$1,500,000 but provides no breakdown of sales between the two products. So, 1,500,000 = 5a + 4b and Cost = 3a + 3b + 500,000. There are now two equations and three variables: Cost, a, and b. Thus, Statement (1) is insufficient; eliminate (A) and (D).

Your solution was correct until this point, but as soon as you start counting equations and unknowns, you are no longer answering the question that was asked. The question does not ask if you can solve for a or b individually -- only then would counting equations and unknowns even potentially be helpful (but with 3 unknowns, the rules are much more complicated than with only 2 unknowns). Instead the question asks merely whether the company made a profit. And if that's the question, the numbers genuinely matter. For example, if we knew the company's revenue was only \$9 (one product of each type), the company clearly could not have covered their \$500,000 fixed cost. Then we'd be sure they took a loss. If instead the company's revenue was \$40 trillion, then since they profit on each sale, then no matter how the sales broke down between products A and B, the company would easily cover their \$500,000 fixed cost, and we could be certain they made a profit.

We know the company profits \$2 for each unit of product A sold, and \$1 for each unit of product B. Their revenue is 5a + 4b. Using both Statements, we can consider two extreme scenarios. Their revenue from A was greater than their revenue from B. It's possible all of their revenue was from A. In that case, 5a = 1,500,000, and a = 300,000. We then know they make a profit of 2a = \$600,000, which would indeed cover their \$500,000 fixed cost. But it's also possible that their revenue from A is almost equal to their revenue from B. So it might be that their revenue from A is slightly greater than half of 1,500,000. Say it's exactly half, so 5a = 750,000. Then a = 150,000. We'd also have 4b = 750,000, and b = 187,500. Since their profit is 2a + b dollars, the profit is \$487,500 (so would be negligibly greater than that if revenue from A is strictly greater than that from B). So it's possible, but only just, that the company fails to cover their \$500,000 fixed cost, and the answer is E. But if the numbers were changed just slightly -- if the revenue were slightly higher, say, or the fraction of the revenue from A was slightly higher -- the answer would be C, or possibly A, depending on the details.

Possibly the best advice I can give to a GMAT test taker who is counting equations and unknowns to solve DS questions is to stop counting equations and unknowns. I've broken down large pools of official DS questions by difficulty level, and have then evaluated how often one would get a right answer by unthinkingly counting equations and unknowns. Even at the medium level, you only get a right answer 1/3 of the time (and the same is true at the hard level), which is almost like guessing randomly when you consider that in DS one or two answer choices can often be ruled out instantly. If you're reading prep company material that recommends the strategy, I'd advise finding better material to study from.
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Re: A company produces and sells two different products. Product A sells f [#permalink]
thinkvision
This Yes/No question provides the selling prices and cost structure for a company producing two products and asks whether revenues exceeded costs. Information that gives an unambiguous answer of yes or no will be sufficient, even if you cannot determine exactly what revenues or costs were.

Convert this word problem into algebra. Let a be the number of units of product A produced and sold and let b represent the number of units of product B produced and sold.

The equation for revenue is selling price times quantity. So, Revenue = \$5a + \$4b.

The variable cost for each unit of product A is 60% of \$5 or 0.60 × \$5, which is \$3, and the variable cost for each unit of product B is 75% of \$4 or 0.75 × \$4, which is also \$3. The company also has \$500,000 of fixed costs each year. Thus, Cost = \$3a + \$3b + \$500,000.

The question asks whether revenue exceeds costs, which translates to "Is 5a + 4b > 3a + 3b + 500,000?" This further simplifies to "Is 2a + b > 500,000?"

Evaluate the statements

Statement (1) says that total sales were \$1,500,000 but provides no breakdown of sales between the two products. So, 1,500,000 = 5a + 4b and Cost = 3a + 3b + 500,000. There are now two equations and three variables: Cost, a, and b. Thus, Statement (1) is insufficient; eliminate (A) and (D).

Statement (2) says that the revenue from product A exceeded the revenue from product B, or 5a > 4b. Lacking any information about a or b individually, you can't solve for a and b or for 2a + b. This statement is insufficient. Eliminate (B) and proceed to evaluate the statements together.

Since Statement (1) has two equations and three variables and Statement (2) is an inequality (not an equation), there's still no way to get a or b individually or (2a + b). Therefore, even taken together, the statements are insufficient. (E) is correct.

TAKEAWAY: Convert word problems into algebra before evaluating the statements so that you know what information is needed to determine sufficiency.

the company sold the same number of units of each product as it produced. => a and b are equal ....
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Re: A company produces and sells two different products. Product A sells f [#permalink]
To come up 1.5M revenue within “ the company sold the same number of units of each product as it produced.” statement a=b It should produce 166666.7777 products each. This makes No profit or no loss and give Yes to A.

Which point did I miss?

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Q51  V47
Re: A company produces and sells two different products. Product A sells f [#permalink]
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ataman
“ the company sold the same number of units of each product as it produced.” statement a=b It should produce 166666.7777 products each.

Abhineetegi
the company sold the same number of units of each product as it produced. => a and b are equal ....

That's not what that sentence means. If the sentence said:

"The company sold the same number of units of each product."

without the extra words at the end, then that would mean a = b. But as written, the sentence is not comparing how many units of A were sold and how many of B were sold. It is comparing how many units of A were sold and how many units of A were produced, and similarly for B. It's just saying that the company sold every unit that it made.

As I pointed out in my post above, the wording here is not exactly like what you'd see on the GMAT. There are simpler ways to express what this sentence is attempting to express, and I'd expect a real GMAT question to use simpler language than this one does.
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Re: A company produces and sells two different products. Product A sells f [#permalink]
The answer is D. Correct me if I am wrong.
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Q51  V47
Re: A company produces and sells two different products. Product A sells f [#permalink]
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