The following data relate to Ramesh Company’s defined benefit pension plan: 

                                                                                              ($ in millions) 

Plan assets at fair value, January .......................................................... $600         

Expected return on plan assets...................................................................60         

Actual return on plan assets.........................................................................48         

Contributions to the pension fund (end of year)...............................100         

Amortization of net loss................................................................................10         

Pension benefits paid (end of year)...........................................................11         

Pension expense.................................................................................................2       

Required: 

Determine the amount of pension plan assets at fair value on December 31.