Based on the projections of an insurance company, the likelihood of policy renewals for the upcoming year varies depending on the type of insurance held by the policyholders. Here are the specific probabilities for policy renewals:

• 40% of individuals who have only an auto insurance policy are expected to renew.
• 70% of individuals who have only a homeowner's insurance policy are anticipated to renew.
• 80% of individuals who hold both auto and homeowner's insurance policies are estimated to renew at least one of these policies.

Furthermore, the distribution of policyholders in terms of their insurance coverage is as follows:

• 70% of the policyholders have auto insurance.
• 50% of the policyholders have homeowner's insurance.
• 20% of the policyholders have both auto and homeowner's insurance.

Using this information, calculate the proportion of policyholders that is projected to renew at least one policy in the next year.