Problem $17-4($Algo$)$ Prior service cost; components of pension expense; present value concepts $[$LO$17-3,17-6]$

Sachs Brands's defined benefit pension plan specifies annual retirement benefits equal to $1\mathrm{.}6\%$ service years $$ final year's salary, payable at the end of each year. Angela Davenport was hired by Sachs at the beginning of $2010$ and is expected to retire at the end of $2044$ after $35$ years' service. Her retirement is expected to span $18$ years. Davenport's salary is $$99,000$ at the end of $2024$ and the company's actuary projects her salary to be $$325,000$ at retirement. The actuary's discount rate is $9\%.$

Note: Use tables, Excel, or a financial calculator. $($FV of $$1,$ PV of $$1,$ FVA of $$1,$ PVA of $$1,$ FVAD of $$1$ and PVAD of $$1)$

At the beginning of $2025,$ the pension formula was amended to:

$1\mathrm{.}80\%$ Service years $$ Final year's salary

The amendment was made retroactive to apply the increased benefits to prior service years.

Required:

What is the company's prior service cost at the beginning of $2025$ with respect to Davenport after the amendment described above?

Since the amendment occurred at the beginning of $2025,$ amortization of the prior service cost begins in $2025.$ What is the prior service cost amortization that would be included in pension expense?

What is the service cost for $2025$ with respect to Davenport?

What is the interest cost for $2025$ with respect to Davenport?

Calculate pension expense for $2025$ with respect to Davenport, assuming plan assets attributable to her of $$150,000$ and a rate of return $($actual and expected$)$ of $10\%.$