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# GENG 360: Engineering Economy 1. The U. Border Patrol is considering the purchase of a new helicopter for aerial surveillance of the New Mexico-Texas...

GENG 360: Engineering Economy1. The U.S. Border Patrol is considering the purchase of a new helicopter for aerial surveillance of the New Mexicoâ€“Texas border with Mexico. A similar helicopter was purchased 4 years ago at a cost of$140,000. At an interest rate of 7% per year, what would be the equivalent value today of that $140,000 expenditure?2. The current cost of liability insurance for a certain consulting firm is $65,000. If the insurance cost is expected to increase by 4% each year, what will be the cost 5 years from now?3. Find the numerical value of the following factors by (a) interpolation and (b) using the appropriate formula.i. (P/F,18%,33) ii. (A/G,12%,54)4. A cash flow sequence starts in year 1 at $3000 and decreases by $200 each year through year 10. (a) determine the value of the gradient G; (b) determine the amount of cash flow in year 8; and (c) determine the value of n for the gradient.5. San Antonio is considering various options for providing water in its 50-year plan, including desalting. One brackish aquifer is expected to yield desalted water that will generate revenue of $4.1 million per year for the first 4 years, after which less production will decrease revenue each year by $50,000 per year. If the aquifer will be totally depleted in 25 years, what is the present worth of the desalting option at an interest rate of 6% per year?

Sol: (1)P = 140,000(F/P,7%,4)=140,000(1.3108)= $183,512Sol: (2)F = 65,000(F/P,4%,5)= 65,000(1.2167)= $79,086Sol: (3) (a) 1. Interpolate between n = 32 and n = 34:1/2 = x/0.0014x = 0.0007...