
Concept explainers
To find: The original investment of Graham’s, check this investment is increasing or decreasing and find the time when the investment will be worth half of its starting value.

Answer to Problem 7.5.4P
The original investment was
Explanation of Solution
Given information:
The equation is
Calculation:
Substitute 0 for
So, the original investment is
Find the value of
Substitute
Substitute
So, as the value of
Substitute
Take the
Therefore, the original investment was
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