$54,500 was the service cost for the year
Solution:
Beginning PBO ($7,000/10%) Â Â Â Â Â Â Â Â Â $70,000
Service cost                        54,500*
Interest cost                         7,000
Retiree benefits paid                 (14,500)
Ending PBO Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â $117,000
*$117,000+ $14,500–$7,000 -$70,000= $54,500