The half-life of 14C is 5730 years. The decay rate of 14C in…

The half-life of 14C is 5730 years. The decay rate of 14C in living matter is 15.3 disintegrations/(min*g C). How old is a piece of a sail (made from plant fibers) that has 12.8 disintegrations/(min*g C)? Answer in years. Do not type units. Do not use scientific notation.