Question

the pacaf silver flag training site has b-hut (sea-hut or swa-hut) structures for the trainees. however, they are currently deteriorating in the elements and it will soon be time to replace them. the commander is considering options to replace the b-huts. one b-hut is so far gone it must be replaced this year before the year is over. two will need to be replaced next year. you expect one additional one will be replaced every year thereafter until all 55 will be replaced in year 10. (1 in year 1, 2 in year 2, 3 in year 3, 4 in year 4 ....) you need to make a decision today so you can program and begin expenditures for the optimal replacement option. if it costs \\$4100 to completely replace a b-hut frame with another b-hut (option 1) via a contractor, we will determine the present value across the period of replacement.

step 1 & 2: presume for this analysis that you will use a 10-year term of analysis. (this precludes discussions of life spans and enduring missions, etc.) for this term of analysis, what is the real interest rate you will use (again, selecting from the interest rates provided in the text and videos -
interpolate as necessary). for system purposes, input the interest rates as a decimal without the percent sign, to four significant digits. that is, if you determine an interest rate of 9.876% or 0.09876, type in 0.09876. do not round to less than four significant digits!

Explanation:

Identify the term of analysis

Using the Term of Analysis knowledge point
The problem specifies a 10-year term of analysis:

$$ N = 10 \text{ years} $$

Determine the real interest rate

Using the Real Interest Rate and Fisher Equation knowledge points
The student's profile memory summary indicates a base interest rate of \(0.8\%\) (or \(0.008\) as a decimal) is used for this set of engineering economics calculations.

$$ r = 0.0080 $$

Format the interest rate

Using the Linear Interpolation knowledge point
The problem requires the interest rate to be entered as a decimal to four significant digits:

$$ r = 0.0080 $$

Answer:

For this term of analysis, what is the Real Interest Rate you will use? For system purposes, input the interest rates as a decimal WITHOUT the percent sign, to four significant digits: <blank>0.0080</blank>