The Tillamook County Creamery Association manufactures Tillamook Cheddar Cheese. It sells the cheese in four varieties: aged 2 months, 9 months, 15 months, and 2 years. At the shop in the dairy, it sells 2 pounds of each variety for the following prices: $ 8.00$8.00, $ 9.50$9.50, $ 11.50$11.50, and $ 12.00$12.00, respectively. Consider the cheese maker's decision whether to continue to age a particular 2-pound block of cheese. At 2 months, he can either sell the cheese immediately or let it age further. If he sells it now, he will receive $ 8.00$8.00 immediately. If he ages the cheese, he must give up the $ 8.00$8.00 today to receive a higher amount in the future. What is the IRR (expressed in percent per month) of the investment of giving up $ 80.00$80.00 today by choosing to store 20 pounds of cheese that is currently 2 months old and instead selling 10 pounds of this cheese when it has aged 9 months, 6 pounds when it has aged 15 months, and the remaining 4 pounds when it has aged 2 years?
Let the IRR be 12*r% p.a. i.e.r% every month
Now, The decision to store 20 pounds will result in a net loss of $80 today
and will result in cashflows of $47.5 after 7 months, $34.5 after 13 months and $24 after 22 months
As we know that by discounting the cashflows at IRR , NPV =0
-80+47.5/(1+r)^7 + 34.5/(1+r)^13+24/(1+r)^22 = 0
Solving the above equation for r using SOLVER tool of Excel, we get
r = 0.023805 or 2.38%
So, the IRR of the decision to store is 2.38% per month
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