A postretirement plan promises health care coverage for all employees who retire after age $62$ and complete service of $15$ years. As of January $1,2020,$ one $50-$year old participant has rendered services for $8$ years, and is expected to retire at age $65.$ The following amounts pertain to the participant$$s benefits.

Present value of postretirement benefit cash flow stream at the date of retirement $$30,000$

Present value of postretirement cash flow stream on Jan. $1,2020$ $$4,000$

Calculate the accumulated postretirement benefit obligation $($APBO$)$ on January $1,2020?$