Answer:
a. Best deal is 30 end-of-year payments of $5.6 million
b. Best deal is 10 end-of-year payments of $9.5 million
c. Best deal is lump sum today of $62 million
Explanation:
Please see attachment for workings.
d. As the interest rate increases, the duration of value shortens. That is as the interest rate increases, the best choose based on their payment duration reduces