A certain door-to-door salesman sells 3 sizes of brushes, which he calls large, extra large, and giant. He estimates that among the persons he calls upon the probabilities are 0.4 that he will make no sale, 0.3 that he will sell a large brush, 0.1 that he will sell an extra large brush, and 0.2 that he will sell a giant brush. Find the probability that in 4 calls he will sell (i) no brushes, (ii) 4 large brushes, (iii) at least 1 brush of each kind.