Suppose that three girls, A,B,and C throw snowballs at a target. Suppose Girl A throws 10 times and the probability she hits the target on any given throw is 0.3. Girl B throws 15 times, with a prob. of success = 0.2. And girl C throws 20 times, with a probability of success equal to 0.1. Determine the probability that the target will get hit at least 12 times.