I was thinking without any calculations that since the exchange rate did not change x is irrelevant. However Y is still essential.

If you are running out of time on the math session, just pick B and move on.

If you have some time to spare, then you verify with calculation.

topmbaseeker wrote:

1000 dollars were converted into pounds and then the pounds were converted back into dollars at the same exchange rate of

x pounds per dollar. If a commission of

y% is levied on any exchange operation, what dollar amount was left after the exchanges?

1.

x = 0.6 2.

y = 5 * Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient

* Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient

* BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient

* EACH statement ALONE is sufficient

* Statements (1) and (2) TOGETHER are NOT sufficient

Source: GMAT Club Tests - hardest GMAT questions

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