Answer:
$233,677,865.61
Explanation:
The computation of the present value of this liability is given below:
As we know that
Future value = Present value ×  (1 + rate)^number of years
So,
Present value = Future value ÷ (1 + rate)^number of years
            = $568,000,000 ÷ (1 + 6.1%)^15
            = $568,000,000 ÷ 2.430696628
            = $233,677,865.61