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MartyMurray Can you please explain how you derived this equation ?
MartyMurray
­Retailer Z acquired a certain refrigerator and then sold it. Retailer Z's cost to acquire the refrigerator was what percent of the selling price of the refrigerator?

We are looking for Cost/Selling price. So, as long as we can determine that ratio, we can determine the answer.

(1) At the same selling price, the retailer’s gross profit on the refrigerator would have been 15 percent greater if the cost to acquire it had been 10 percent less.

Gross Profit = Selling Price - Cost

So, by using the information provided by this choice, we can find the ratio Cost/(Selling Price - Cost), as follows:

0.15 × (Selling Price - Cost) = 0.10 × Cost

0.15/0.10 = Cost/(Selling Price - Cost)

3/2 = Cost/(Selling Price - Cost)

Then, since Selling Price = Cost + Selling Price - Cost, we can also find the ratio Cost/Selling Price,  as follows:

Cost/Selling Price = Cost/(Cost + Selling Price - Cost) = 1/(1 + 2/3) = 3/5

Notice that we don't need to do the above math to answer this DS question. We just need to see that once we have ratio Cost/(Selling Price - Cost), we can get to the answer.

Sufficient.

(2) At the same selling price, the retailer’s gross profit on the refrigerator would have been 3 percent less if the cost to acquire it had been 2 percent greater.

As we can with the information provided by statement (1), we can use the information provided by this choice to findi the ratio Cost/Selling Price - Cost and then work our way to Cost/Selling Price.

Sufficient.

Correct answer: D­
­
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MartyMurray
­Retailer Z acquired a certain refrigerator and then sold it. Retailer Z's cost to acquire the refrigerator was what percent of the selling price of the refrigerator?

We are looking for Cost/Selling price. So, as long as we can determine that ratio, we can determine the answer.

(1) At the same selling price, the retailer’s gross profit on the refrigerator would have been 15 percent greater if the cost to acquire it had been 10 percent less.

Gross Profit = Selling Price - Cost

So, by using the information provided by this choice, we can find the ratio Cost/(Selling Price - Cost), as follows:

0.15 × (Selling Price - Cost) = 0.10 × Cost

0.15/0.10 = Cost/(Selling Price - Cost)

3/2 = Cost/(Selling Price - Cost)

Then, since Selling Price = Cost + Selling Price - Cost, we can also find the ratio Cost/Selling Price,  as follows:

Cost/Selling Price = Cost/(Cost + Selling Price - Cost) = 1/(1 + 2/3) = 3/5

Notice that we don't need to do the above math to answer this DS question. We just need to see that once we have ratio Cost/(Selling Price - Cost), we can get to the answer.

Sufficient.

(2) At the same selling price, the retailer’s gross profit on the refrigerator would have been 3 percent less if the cost to acquire it had been 2 percent greater.

As we can with the information provided by statement (1), we can use the information provided by this choice to findi the ratio Cost/Selling Price - Cost and then work our way to Cost/Selling Price.

Sufficient.

Correct answer: D­
­Hi
I am not clear with how the equation is dervieved
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Question is asking what is \(\frac{C}{S}\)

1) \(\frac{(S-C)}{(S-0.9C)} = 115/110\). Sufficient.

Note we can rearrange to get relationship between C and S, but we dont need to find the relationship, we just need to know we can get it. Sufficient.

2) Same principle as statement 1, just with different numbers. Sufficient. Answer is D, both statements individually are sufficient.
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P = R - C
asking for C = (x/100)* R -> x = C/R -> C/R ?

1) P = R - C
(115/100)P = (100/100)R - (90/100)C -> (115/100)(R-C) = (100/100)R - (90/100)C -> 115R - 115C = 100R - 90C -> 15R = 25C , SUFF BECAUSE C/R = 15/25

2) P = R - C
(97/100)P = (100/100)R - (102/100)C -> (97/100)(R-C) = (100/100)R - (102/100)C -> 97R - 97C = 100R - 102C -> 5C = 3R , SUFF BECAUSE C/R = 3/5
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