Statistics question, how do I calculate percentile?

Update: Here is the question; You will qualify for economic assistance if you fall in the bottom 20% of income earners. The population mean is $20000 and the standard deviation is $4500. You earn $13000. Possible answers... (A)You meet the cut-off; you are in the 6th percentile (B) You meet the cut-off; you are in the... show more Here is the question; You will qualify for economic assistance if you fall in the bottom 20% of income earners. The population mean is $20000 and the standard deviation is $4500. You earn $13000. Possible answers...

(A)You meet the cut-off; you are in the 6th percentile
(B) You meet the cut-off; you are in the 44th percentile
(C) You do not meet the cut-off; you are in the 56th percentile (D) You do not meet the cut-off; you are in the 94th percentile (E) None of (A, B, C, D) are true
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