I can't get this right. Please help!

According to a University Center for Logistics Management, 10% of all merchandise sold in the United States gets returned. A Seattle department store sampled 86 items sold in January and found that 6 of the items were returned. If you have the following null and alternative hypotheses for a test you are running: H0:p=0.1 Ha:p0.1 Calculate the test statistic by hand, rounded to 3 decimal places