Interest Formulas – Equal Payment Series

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Interest Formulas – Equal Payment Series Lecture No.7 Chapter 3 Contemporary Engineering Economics Copyright © 2010 Contemporary Engineering Economics, 5th edition, © 2010

Equivalent Future Worth Equal Payment Series F Equivalent Future Worth 1 2 N A A A P N 1 2 N Contemporary Engineering Economics, 5th edition, © 2010

Equal-Payment Series Compound Amount Factor Formula Contemporary Engineering Economics, 5th edition, © 2010

An Alternate Way of Calculating the Equivalent Future Worth, F A(1+i)N-2 A A A A(1+i)N-1 N 1 2 1 2 N Contemporary Engineering Economics, 5th edition, © 2010

Example 3.14 Uniform Series: Find F, Given i, A, and N Given: A = $3,000, N = 10 years, and i = 7% per year Find: F Excel Solution: Contemporary Engineering Economics, 5th edition, © 2010

Example 3.15 Handling Time Shifts: Find F, Given i, A, and N Given: A = $3,000, N = 10 years, and i = 7% per year Find: F Excel Solution: Each payment has been shifted to one year earlier, thus each payment would be compounded for one extra year Contemporary Engineering Economics, 5th edition, © 2010

Sinking-Fund Factor: Find A, Given i, N, and F Given: F = $5,000, N = 5 years, and i = 7% per year Find: A Excel Solution: Formula – Sinking Fund Factor $5,000 1 5 =PMT(7%,5,0,5000) A Contemporary Engineering Economics, 5th edition, © 2010

Example 3.17 Comparison of Three Different Investment Plans Given: Three investment plans and i = 8% Find: Balance on the 65th birthday Contemporary Engineering Economics, 5th edition, © 2010

How Long Would It Take to Save $1 Million? Contemporary Engineering Economics, 5th edition, © 2010

Example 3.18 Uniform Series: Find A, Given P, i, and N Capital Recovery Factor Given: P = $250,000, N = 6 years, and i = 8% per year Find: A Formula to use: Excel Solution: Contemporary Engineering Economics, 5th edition, © 2010

Example 3.19 – Deferred Loan Repayment Given: P = $250,000, N = 6 years, and i = 8% per year, but the first payment occurs at the end of year 2 Find: A Step 1: Find the equivalent amount of borrowing at the end of year 1: Step 2: Use the capital recovery factor to find the size of annual installment: Contemporary Engineering Economics, 5th edition, © 2010

Example 3.20 Uniform Series: Find P, Given A, i, and N Present Worth Factor Given: A = $10,576,923, N = 26 years, and i = 5% per year Find: P Formula to use: Excel Solution: Contemporary Engineering Economics, 5th edition, © 2010