On January 1, 2008, Pratt Corp. adopted a defined-benefit pension plan. The plan's service cost of $300,000 was fully funded at the end of 2008. Prior service cost was funded by a contribution of $120,000 in 2008. Amortization of prior service cost was $48,000 for 2008. What is the amount of Pratt's prepaid pension cost at December 31, 2008?