Rodeo corporation amended its defined benefit pension plan on January 31, 2011, ti increase retirement benefits earned with each service year. The actuary estimated the prior service cost to be $300,000. Rodeo's 60 present employees are expected to retire at the rate of about 15 each year at the end of each of the next 4 years beginning on December 31, 2011. Using the straight-line method determine the amount of prior service costs to be amortized to pension expense in each of the next four years