A lawn care service makes telephone solicitations, seeking customers for the coming sea- son. A review of the records indicated that 15% of these solicitations produced new customers, and that, of these new customers, 80% had used some rival service in the pre- vious year. It was also estimated that, of all solicitation calls made, 60% were to people. who had used a rival service the previous year. What is the probability that a call to a person who used a rival service the previous year will produce a new customer for the lawn care service?