166 PRESENTWORTH ANALYSIS
5-5 Compute the value ofPfor the following diagram. 5-8 Ifi=10%, what is the value ofP?
B B B B
120 120 120 t t t t
t r 5; r t r o-[-2-3-4-5-6-7~~'oo
0-[-2-3-4-5-6-7-8-9 1
j
i=lO% P
5-9 A stonecutter, assigned to carve the headstone for a
well-known engineering economist, began with the
p following design.
5-6 Compute the value ofPfor the following diagram.
5G
4G
60 60 60 60 60
t t t t t
0-1-2-3-4-5
1
120
r
G
f
0-1-2-3-4-5
2G
r
3G
r
i= 10%
p
p
(Answer:P=$324.71)
5-7 Use a geometric gradient factor to solve the following
diagram forP.
He then started the equation as follows:
P=G(PjG,i,6)
266.20
He realized he had made a mistake. The equation
should have been
P=G(PjG, i,5) +G(PjA, i, 5)
i= 15%
The stonecutter does not want to discard the stone and
start over. He asks you to help him with his problem.
The right-hand side must be for the first equation to
be correct for the carved figure, mul!iplied by one
compound interest factor, taking the form:
. ''Op= G(PjG, i,6)( ,i, )
p Write the complete equation.
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