A screening examination was performed on 250 persons for Factor X, which is found in disease Y. A definitive diagnosis for disease Y among the 250 persons had been obtained previously.

The results are charted below:

RESULTS OF DIAGNOSIS
Test Results	Disease Present	Disease Absent
Positive for Factor X	40	60
Negative for Factor X	10	140

The positive predictive value of this test is:

		40%
		56%
		70%
		80%
		93%