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The conventional process for tanning leather uses large

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The conventional process for tanning leather uses large [#permalink]

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New post 22 Nov 2013, 12:15
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Question Stats:

72% (01:43) correct 28% (02:54) wrong based on 219 sessions

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The conventional process for tanning leather uses large amounts of calcium oxide and sodium sulfide. Tanning leather using biological catalysts costs about the same as using these conventional chemicals if the cost of waste disposal is left out of the comparison. However, nearly 20 percent less waste is produced with biological catalysts, and waste disposal is a substantial part of the overall cost of tanning. It is therefore less costly to tan leather if biological catalysts are used instead.

Which one of the following is an assumption required by the argument?

(A) Leather tanned using the conventional process is not lower in quality than is leather tanned using biological catalysts.

(B) The biological catalysts that can be used in the tanning process are less costly by weight than are calcium oxide and sodium sulfide.

(C) New technological innovations have recently made the use of biological catalysts in the tanning process much more cost effective.

(D) Disposal of tanning waste produced with biological catalysts does not cost significantly more than disposal of the same amount of waste produced with the conventional process.

(E) The labor costs associated with tanning leather using biological catalysts are not any greater than the labor costs associated with the conventional tanning process.

Source: LSAT
[Reveal] Spoiler: OA

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Re: The conventional process for tanning leather uses large [#permalink]

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New post 22 Nov 2013, 22:12
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Premise 1 : Conventional and biological catalyst methods cost the same if cost of waste disposal is not considered.
Premise 2 : Biological methods produce 20% less waste.

Conclusion : Biological method is cheaper.

Obvious jump : The cost per unit for disposal of the wastage may be different and can thus make the disposal of waste from the biological method more expensive.

(A) Leather tanned using the conventional process is not lower in quality than is leather tanned using biological catalysts. Irrelevant. We are only concerned about the cost and not the quality of the leather.

(B) The biological catalysts that can be used in the tanning process are less costly by weight than are calcium oxide and sodium sulfide. Irrelevant. Regardless of the cost of the catalysts, the fact that the methods cost the same is given in the premise itself.

(C) New technological innovations have recently made the use of biological catalysts in the tanning process much more cost effective. Irrelevant. Again, the method still costs the same as conventional methods. It may only be more cost effective than it was previously but still costs the same as conventional methods.

(D) Disposal of tanning waste produced with biological catalysts does not cost significantly more than disposal of the same amount of waste produced with the conventional process. Hits the nail on the head. This assumption assures us that the cost of disposing waste produced from the biological method is not much more expensive than the cost of removing the waste from conventional method. This is the answer.

(E) The labor costs associated with tanning leather using biological catalysts are not any greater than the labor costs associated with the conventional tanning process.[/quote] Irrelevant. Regardless of the cost of the labor, the fact that the methods cost the same is given in the premise itself.
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Re: The conventional process for tanning leather uses large [#permalink]

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New post 22 Nov 2013, 23:35
Thanks, it's clear.
I guess, this one is from LSAT, but i'm not sure.

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Re: The conventional process for tanning leather uses large [#permalink]

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New post 26 Sep 2017, 21:12
The conventional process for tanning leather uses large amounts of calcium oxide and sodium sulfide. Tanning leather using biological catalysts costs about the same as using these conventional chemicals if the cost of waste disposal is left out of the comparison. However, nearly 20 percent less waste is produced with biological catalysts, and waste disposal is a substantial part of the overall cost of tanning. It is therefore less costly to tan leather if biological catalysts are used instead.

Which one of the following is an assumption required by the argument?

(A) Leather tanned using the conventional process is not lower in quality than is leather tanned using biological catalysts.
(B) The biological catalysts that can be used in the tanning process are less costly by weight than are calcium oxide and sodium sulfide.
(C) New technological innovations have recently made the use of biological catalysts in the tanning process much more cost effective.
(D) Disposal of tanning waste produced with biological catalysts does not cost significantly more than disposal of the same amount of waste produced with the conventional process.
(E) The labor costs associated with tanning leather using biological catalysts are not any greater than the labor costs associated with the conventional tanning process.

Source: LSAT
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Last edited by broall on 26 Sep 2017, 22:47, edited 1 time in total.
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Re: The conventional process for tanning leather uses large   [#permalink] 26 Sep 2017, 21:12
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