kwah wrote:Attached is a question from GMAT Prep Test 2.

Please advise how to achieve the result.

Answer: E

Thanks,
K

(1) 56 percent of the total expenditures was paid by the 4 highest-contributing countries, each of which paid more than Country X implies that country X is the 5th contributor or lower than that; NOT sufficient.

2) Country X paid 4.8 percent of the total expenditures implies that if all 6 highest contributors paid same amount then each of them paid 67.8/6 = 11.3%, which is > 4.8%, here the answer to the question is "no".
If the 1st contributor paid 51%, country X paid 4.8%, then the other 4 paid (67.8 - 51 - 4.8)/4 = 3%, here the answer to the question is "yes".
No definite answer; NOT sufficient.

Combining (1) and (2), 5th and 6th contributed 67.8 - 56 = 11.8%
Average of 4 highest contributing countries = 56/4 = 14%
If 5th and 6th contributed the same amount, then 11.8/2 = 5.9, which is greater than 4.8%, here the answer to the question is "no".
If 5th contributed 11.8 - 4.8 = 7% and 6th contributed 4.8% then here the answer to the question is "yes".
No definite answer; NOT sufficient.

The correct answer is E.