140 patients presenting with suspected ovarian cancer take part in a study observing the validity of a new tumour marker blood test for ovarian cancer. Out of these 140 patients, 60 had a negative test result. Of the 40 patients who had ovarian cancer, 4 had a negative result.
Please work out the positive predictive value of the new test and select the correct answer from the list below.
Each answer is rounded to 2 decimal points.