Stats Problem

1. The camera department of a large department store sells three different brands of cameras:  Proxima, Yakima, and Tetron.  Approximately 60% of the cameras sold are Yakimas with Tetrons accounting for 30% of sales and Proxima the remaining 10%.  Store records show that approximately ¼ of those who purchase a Yakima return within one year to purchase accessories for their camera.  The corresponding figures for the other two are:  Tetron, 1/5; and Proxima, 3/5.  If a person is known to have purchased an accessory within a year of the purchase of a camera, what is the probability the person purchased a Yakima?