Manhattan Online test Question:

ash g wrote:hi all,

My first post...and yes, me not happy so looking for some help.
Okee, so far I have given Gmatprep Test1 and gone through OG11. Thought of seeing how I fair in Manhattan free test. The 2nd question in Quant was a DS question which I got wrong but dont necessarily agree with the explantion.

Question
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The total cost of producing item X is equal to the sum of item X's fixed cost and variable cost. If the variable cost of producing X decreased by 5% in January, by what percent did the total cost of producing item X change in January?

(1) The fixed cost of producing item X increased by 13% in January.

(2) Before the changes in January, the fixed cost of producing item X was 5 times the variable cost of producing item X.
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My answer - B. Their answer - C.
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They say S2 is insufficient as it doesnt give information about change in Fixed cost. But neither does the question stem. It doesnt mention that fixed cost changed. By GMATPrep standards/interpretation, I would by all means assume that it hasnt changed and mark B as the answer.

Where did I go wrong. Or is it that the question is not correctly worded.

ta,
ash

ash g wrote:Thanks Hemant. My point is - I only have Information given in the question stem. Question stem doesnt mention about change in fixed cost.

Statement1 introduces that. If in this very question if statement2 would have appeared as statement1, I would have said S1 sufficient.

While looking at S2 and S2 alone alongwith question stem - to consider fixed cost not changed is an assumption. To consider fixed cost has changed is an assumption.

I think the wither the question is messed up or that I am having issues switching to non-OG material.
Thanks anyways.

Regards,
Ash