At a mortgage company, 60% of calls are answered by an attendant. the remaining 40% of callers leave their phone numbers. of these 40%, 75% receive a return phone call the same day. the remaining 25% receive a return call the next day. of those who initially spoke to an attendant, 80% will apply for a mortgage. of those who received a return call the same day, 60% will apply. of those who received a return call the next day, 40% will apply. calculate the probability that a person initially spoke to an attendant, given that he or she applied for a mortgage.