Lacy Construction has a noncontributory, defined benefit pension plan. At December 31, 2021, Lacy received the following information: Projected Benefit Obligation ($ in millions) Balance, January 1 $ 1,120 Service cost 90 Prior service cost 42 Interest cost(5.0%) 56 Benefits paid (80 ) Balance, December 31 $ 1,228 Plan Assets ($ in millions) Balance, January 1 $ 530 Actual return on plan assets 56 Contributions 2021 90 Benefits paid (80 ) Balance, December 31 $ 596 The expected long-term rate of return on plan assets was 10%. There were no AOCI balances related to pensions on January 1, 2021. At the end of 2021, Lacy amended the pension formula creating a prior service cost of $42 million. Determine Lacy's pension expense for 2021.