Final answer:
The interest cost for 2016 is calculated by multiplying the expected postretirement benefit obligation of $300 million by the actuary's discount rate of 8%, yielding a cost of $24 million. Therefore, the correct option is C.
Step-by-step explanation:
The interest cost for 2016 can be calculated using the expected postretirement benefit obligation at the beginning of 2016, which is $300 million, and the actuary's discount rate of 8%. The interest cost is the product of the beginning obligation and the discount rate:
Interest Cost = Beginning Obligation × Discount Rate
Interest Cost = $300 million × 0.08
Interest Cost = $24 million
Therefore, the correct answer for the interest cost for 2016 is c) $24.0 million.