The following information related to the Postretirement Benefits (health) for the Union Company on 12/31/2020: Expected postretirement Benefits Obligation (EPBO) $ 800,000, and the Accumulated Postretirement Benefits Obligation (APBO) is $400,000. Attribution period 20 years. 0 Number of years employees worked to date 10 years. Interest rate 10%. Required: a. Calculate the EPBO at end of 2021. b. Calculate accumulated postretirement benefits (APBO) for 2021. c. Analyze the increase in 2021 APBO.