A certain company sends 40% of its overnight mail parcels by means of express mail service A1.

A certain company sends 40% of its overnight mail parcels by means of express mail service A1. Of these parcels, 2% arrive after the guaranteed delivery time (use L to denote the event late delivery). If a record of an overnight mailing is randomly selected from the company’s files, what is the probability that the parcel went by means of A1 and was late?