Solutions For Water and Wastewater Engineering Chapter 1 Problem 1

b.  Calculate A| p factor to be used for all three alternatives. Alternatively, use a table in an engineering economics textbook

c.  Annual cost for connection to WTP

A = $1,500,000 (A| p, 0.06, 20) + $300,000

A = $1,500,000 (0.0872) + $300,000

A = $130,800.00 + $300,000

A = $430,800

d. Annual cost for membrane A

A = $2,374,000 (A| p, 0.06, 20) + $209,000

A = $2,374,000 (0.0872) + $209,000

A = $207,012.80 + $209,000

A = $416,012.80 or $416,000

e. Annual cost for membrane B

A = $2,162,000 (A| p, 0.06, 20) + $258,000

A = $2,162,000 (0.0872) + $258,000

A = $188,526.40 + $258,000

A = $446,526.40 or $446,500

f. Recommend membrane A as least cost