Answer:
The preferred alternative based on a present worth analysis with a MARR of 20% per year is:
the Installation of a water Storage Tank
Explanation:
a) Data and Calculations:
MARR = 20% per year
Time period or planning horizon = 20 years
Alternatives
Tank Pond
Initial costs $309,000 $315,000 ($225,000 + $90,000)
Annual maintenance costs 7,100 16,000
PV annuity factor 4.870 4.870
Total PV: maintenance cost $34,577 $77,920 ($16,000 * 4.870)
Total PW costs $343,577 $392,920 ($315,000 + $77,920)
Present worth is the same as the present value (PV) of a future amount, discounted to the present using a specified rate.
