Slippery Elum is a baseball pitcher who uses three pitches, 60% fastballs, 25% curveballs, and the rest spitballs. Slippery is pretty accurate with his fastball (about 70% are strikes), less accurate with his curveball (50% strikes), and very wild with his spitball (only 30% strikes). Slippery ends one game with a strike on the last pitch he throws. What is the probability that pitch was a curveball?