it says its wrong. pls show steps by steps

Panther Products sponsors a defined benefit pension plan. The following information pertains to that plan: Service cost for 2021 Actual and expected return on plan assets for 2021 2021 amortization of prior service cost Interest on pension obligation for 2021 Retiree benefits paid during 2021 $480 million 105 million 15 million 150 million 30 million The pension expense that Panther should report in its 2021 income statement is Multiple Choice $510 million $540 million $630 million