Brief Exercise 17-1 (Algo) Changes in the projected benefit obligation [LO17-3] The projected benefit obligation was $420 million at the beginning of the year. Service cost for the year was $23 million. At the end of the year, pension benefits paid by the trustee were $19 million and there were no pension-related other comprehensive income accounts. The actuary's discount rate was 5%. What was the amount of the projected benefit obligation at year-end? End of the year PBO I million