The tree in Karura forest grow such that the volume of timber at time t can be represented as 900t + 5ot+ 60t3 +7¢4 Q (t) = (Note that these trees clo not followw a typical biological growth function). The annual real interest rate is 0:19 and each unit of timber Can be sold at a price of Ksh. 100 net of harvest costs. Assume there is no opfort unity Cost of using land to grow tmber . Assume also that at Ě = 89 years from beginning of R trees growth, Kinyua obtoined sole Ownership of the forest threugh a surprise bequest · ) What is the marginal benefit Hinyua would get by H aiting to cut the trees for another year ? i) What is the marginal cast be would incur by Waiting to cut the trees for another year? ii) Should he Wait another year to cut clown the trees ? (N) Assume that the interest rate is different such that t=89 is the exact trees. What is opt imal time to hervest the the annual interest rate ?

ENGR.ECONOMIC ANALYSIS
14th Edition
ISBN:9780190931919
Author:NEWNAN
Publisher:NEWNAN
Chapter1: Making Economics Decisions
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The tree in Karura forest grow such that the volume
of timber at time t can be represented as-
Q (t) = 900t + 5ot+ 60t +7¢4
(Note that thise trees do not follow a typical biological
growth function). The annual real interest rate is
0.19 and each unit of timber Can be sold at a price
of Ksh. 100 net of harvest costs. Assume there is no
opport unity Cost of using lond to grow timber-
Assume also that at Ě =89 years from beginning of
#e trees growtd, Kinyua obtained sole ownership of
the forest through
a surprise bequest ·
i) What is the Marginal benefit Minyua would get by
Haiting to cut the trees for another year ?
O What is the marginal castbe would incur
by
Waiting to cut the trees for another year?
ii) Should he Wait another year to cut clown the trees ?
(v) Assume that the interest rate is different such that
t = 89 is the e xact optimal time to harvest the
trees. Hhat
is
the annual interest rate ?
Scanned with CamScanner
Transcribed Image Text:The tree in Karura forest grow such that the volume of timber at time t can be represented as- Q (t) = 900t + 5ot+ 60t +7¢4 (Note that thise trees do not follow a typical biological growth function). The annual real interest rate is 0.19 and each unit of timber Can be sold at a price of Ksh. 100 net of harvest costs. Assume there is no opport unity Cost of using lond to grow timber- Assume also that at Ě =89 years from beginning of #e trees growtd, Kinyua obtained sole ownership of the forest through a surprise bequest · i) What is the Marginal benefit Minyua would get by Haiting to cut the trees for another year ? O What is the marginal castbe would incur by Waiting to cut the trees for another year? ii) Should he Wait another year to cut clown the trees ? (v) Assume that the interest rate is different such that t = 89 is the e xact optimal time to harvest the trees. Hhat is the annual interest rate ? Scanned with CamScanner
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