Every summer, Frank goes on a week-long canoe trip with his childhood camp friends. After the trip, he usually purchases some oars from the destination city. His collection of oars is organized by year and type of wood. The probability that an oar was purchased in 2012 is 0.4, the probability that it was made from fir wood is 0.3, and the probability that it was purchased in 2012 and was made from fir wood is 0.1. What is the probability that a randomly chosen oar was purchased in 2012 or was made from fir wood?