Carson, Inc. started a defined benefit pension plan at the beginning of this year. The company has ten employees. Five of the employees have 20 years to work before retirement, three of the employees have 15 years to work before retirement, and two employees have 10 years to work before retirement. The company has an unamortized prior service cost of $475,000. Using the sum of the service years approach how much amortization of prior service cost should be included in pension expense for this year? $ 28,788. $ 39,000 $ 42,500 $ 25,000