9. When John and Kathy moved in together 10 months ago they both agreed to share the responsibility for the household chores equally. Kathy has been keeping a daily record of John's efforts. 40% of the time John prepares dinner and 35% of the time he does the dishes. On those days that John prepares dinner, he does the dishes 30% of the time. What is the probability that John does at least one of these chores on a given day?