Determine and record pension expense and gains and losses; funding and retiree benefits [LO17-6, 17-7] Actuary and trustee reports indicate the following changes in the PBO and plan assets of Mahomes Industries during 2024: Prior service cost at January 1, 2024, from plan amendment at the beginning of 2021 (amortization: $4 million per year) $ 28 million Net lossAOCI at January 1, 2024 (previous losses exceeded previous gains) $ 80 million Average remaining service life of the active employee group 10 years Actuary\'s discount rate 7% ($ in millions) PBO Plan Assets Beginning of 2024 $ 600 Beginning of 2024 $ 400 Service cost 80 Return on plan assets, 8% (10% expected) 32 Interest cost, 7% 42 Loss (gain) on PBO (14) Cash co