5. Ashley, in Problem 6, has discovered another wine, wine D. Wine drinkers are willing to pay 40
dollars to drink it right now. The amount that wine drinkers are willing to pay will rise by 20 dollars
each year that the wine ages. The interest rate is 10%. How much would Ashley be willing to pay for
the wine if he buys it as an investment? (Pick the closest answer.)
6. Chillingsworth from Problem 10 has a neighbor, Shivers, who faces the same options for insulating his
house as Chillingsworth. But Shivers has a larger house. Shivers’s annual fuel bill for home heating is
1,200 dollars per year. Plan A will reduce his annual fuel bill by 15%, plan B will reduce it by 20%,
and plan C will eliminate his need for heating fuel altogether. The plan A insulation job would cost
Shivers 1,200 dollars, plan B would cost him 1,700 dollars, and plan C would cost him 13,200 dollars.
If the interest rate is 10% and his house and the insulation job last forever, which plan is the best for
Shivers?
Plans A and B are equally good.
He is best off using none of the plans.
7. Chillingsworth from Problem 10 has a neighbor, Shivers, who faces the same options for insulating his
house as Chillingsworth. But Shivers has a larger house. Shivers’s annual fuel bill for home heating is
1,100 dollars per year. Plan A will reduce his annual fuel bill by 15%, plan B will reduce it by 20%,
and plan C will eliminate his need for heating fuel altogether. The plan A insulation job would cost
Shivers 1,100 dollars, plan B would cost him 2,000 dollars, and plan C would cost him 12,100 dollars.
If the interest rate is 10% and his house and the insulation job last forever, which plan is the best for
Shivers?
Plans A and B are equally good.
He is best off using none of the plans.
8. Chillingsworth from Problem 10 has a neighbor, Shivers, who faces the same options for insulating his
house as Chillingsworth. But Shivers has a larger house. Shivers’s annual fuel bill for home heating is
1,200 dollars per year. Plan A will reduce his annual fuel bill by 15%, plan B will reduce it by 20%,
and plan C will eliminate his need for heating fuel altogether. The plan A insulation job would cost
Shivers 1,200 dollars, plan B would cost him 1,900 dollars, and plan C would cost him 13,200 dollars.
If the interest rate is 10% and his house and the insulation job last forever, which plan is the best for
Shivers?
Plans A and B are equally good.