10. A motorcycle insurance company has 7000 policyholders of whom 5000 are under 40.

If 4100 of the policyholders are males and under 40, 1100 are married and under 40, and 550 are married males who are under 40, find the probability that the next motorcycle policyholder of this company who gets into an accident is a single female who is under 40. Assume that it is equally likely for all policyholders to get into an accident.