Skeletal Remains of the So-Called "Pittsburgh Man", Unearthed in Pennsylvania

Short Answer

Skeletal remains of the so-called "Pittsburgh Man", unearthed in Pennsylvania, had lost 86% of the carbon 14 they originally contained. Determine the approximate age of the bones. Round your answer to the nearest year. Hint: the decay constant k for carbon 14 is equal to 0.00012.
__________ years