Of an insurance company’s policyholders, 20 percent are high risk, 40 percent are low risk, and 40 percent are intermediate risk. Of the low-risk policyholders, 2 percent have an accident during a year, 4 percent of intermediate-risk policyholders have an accident during a year, and 20 percent of high-risk policyholders have an accident during a year. If a policyholder has an accident, what is the chance he or she was a high-risk policyholder?