Quiz Book Summer 2003 Prepared by: Eng. Ahmed Taha

Quiz 1 Considering the class policies, indicate whether each of the following statements is True (T) or False (F) by circling T or F next to each statement

Quiz 2 Depict the following transactions on a cash flow diagram: Depositing $4,000 today and withdrawing $2,000 after two years. The rest of the money is withdrawn after 4 years. If the interest rate is 10%, how much money will be available for the last withdrawal How long would it take for $200 to double if the interest rate is 12%? 14 2 i = 10% F=? year $4000 $2000 [ (P/F,10%,2)](F/P,10,4) + F = 0  F = $ = 200(F/P,12%,n)  (F/P,12%,n) = 2 Using interpolation n = 6.11 years (almost 6 years & 1 month)

Quiz 3 Determine the annual installments of a loan of $5,000 to be paid in 5 equal end-of-year payments if the interest rate is 10%. Find P in the graph to the right assuming that A = $1,000, and i = 10% A = P (A/P,10%,5) A = 5000 (0.2638)  A = $1319 -P (P/A,10%,7) = 0  P = A=? i = 10% $5,000 year

Quiz 4 With i=10% find the present value of the series below Find an equivalent payment A for the series above P = 2500 (P/A,10%,4)-500(P/G,10%,4) = 2500 (3.1699)-500(4.3781)  P = $ solution 1: A = (A/P,10%,4) = $1809 -solution 2: P G = -500(4.3781) A 2 = P G (A/P,10%,4) = $ A f = = $ i = 10% year $2500 $2000 $1500 $ i = 10% year $500 $1500 $

Quiz 5 What interest rate is being charged if a loan of $10,000 received today is to be repaid in 5 equal end-of-year payments of $2400 each? Which is better, to buy a computer by paying $2,000 immediately, or by paying 5 equal end-of-year payments of $2400 each, if you can invest your money at 8%? Why? P = A (P/A,i%,5) 10,000 = 2400 (P/A,i%,5)  (P/A,i%,5) = using interpolation  i= 6.4% P = A(P/A,8%,5) P = 500 (P/A,8%,5)  P = $ A=2400 i = ?% $10,000 year Five equal payments would be slightly better.

Quiz 6 What lump sum would have to be deposited today into an account bearing interest of 10% per year to provide withdrawals of $1000 8,9,10,11 years from today? How many years will it take for a uniform annual deposit of size A to have the same value as a single deposit now that is 4 times the size of one annual deposit? Assume that i = 10%. P = 1000(P/A,10%,4)(P/F,10%,7)  P = P = A(P/A,10%,n) 4A = A(P/A,10%,n)  (P/A,10%,n) = 4 Using extrapolation  n = 5.37 years A=2400 i = 10% P=? year 0 n1 A i = 10% P=4A year

Quiz 7 A loan of $50,000 is to be repaid in 8 equal end-of-year payments at 10% a.Find the value of the installments b.After 3 years, how much of the loan would be paid? c.How much would it cost to buy down the interest to 9%? a.A= 50,000(A/P,10%,8) = $9, b.X =50,000(F/P,10%,3)–9, (F/A,10%,3)  X = $35, Paid amount = 50,000- X = $14, c. A 1 = 50,000(A/P,10%,8) = $9, A 2 = 50,000(A/P,9%,8) = $9,  Cost = (A 1 - A 2 ) (A/P,9%,8)= $1, A=? i = 10% year $50,000 1

Quiz 8 Consider the following mutually exclusive investment alternatives (MARR=10%): Compare the three alternatives based on PW. Which is better? PW a = (P/A,10%,5)+ 200 (P/F,10%,5) = $7.58 PW b = -4, (P/A,10%,5)+ 2,500(P/F,10%,5) = -$ PW b = -5, (P/A,10%,5)+ 4,500(P/F,10%,5) = $ A MARR = 10% year S 1 P Without performing any calculations, which of B&C have a higher ROR? C

Quiz 9 Consider the following mutually exclusive investment alternatives (MARR=10%): Which alternatives are feasible based on their ROR 0 = (P/A,i%,5)+200(P/F,i%,5) Using trial & Error  i=12.57% > MARR 0 = (P/A,i%,5)+2600(P/F,i%,5)  i=9.74% < MARR (rejected) 0 = (P/A,i%,5)+4300(P/F,i%,5)  i=10.13% > MARR 0 5 A MARR = 10% year S 1 P See next slide for the best alternative based on the ROR?

Quiz 9 continued To determine which of A or C is better we must calculate the ROR based on the difference. i = 10.03% 0 5 A MARR = 10% year S 1 P Based on this, we may say that C is better than A, or that the difference is too small and for all practical purposes we may consider them equivalent. In other words, doing A and investing the rest at 10% is almost the same as doing C.

Quiz 10 I.Which is better: I.4 end-of-year receipts of $1,000each, and a on time receipt of $3,000 at the end of the fifth year. II.$500 annually forever assuming that the prevalent interest rate is 10% a.PW = -1,000(P/A,10%,5)-2,000(P/F,10%,5) = -1,000(3.7907)-2,000(0.6209) = $ a.PW = A/i = -500/0.1 = -$5, $1,000 i = 10%year $2,000 1 II. Find the discounted payback period of the cash flow diagram to the right assuming P= $5,000, A=$1,400, and MARR = 10%. Draw the investment balance diagram. a 0  $500 i = 10%year 1 5

Quiz 11 A bond with a face value of $5,000 pays interest of 10% per year will be redeemed at a par value at the end of its 10-year life. How much should be paid for this bond now in order to yield: 8% per year. 12% per year. A = 5000(0.1)=500 i= 8%  P = 500(P/A,8%,10)+5000 (P/F,8%,10) = $5671 i= 12%  P = 500(P/A,12%,10)+5000 (P/F,12%,10) = $ In both cases above, if the bond had a life of 8 years, would it be better(higher PW) or worse? 0 10 A= $500year $5,000 1 P i= 8%  P = 500(P/A,8%,8)+5000 (P/F,8%,8) = $ (Worse) i= 12%  P = 500(P/A,12%,8)+5000 (P/F,12%,8) = $ (Better)

Quiz 12 What is the B/C ratio of an investment that requires an initial payment of $8,000 in return for equal end-of-year returns of $3,000 for 8 years, if the O&M expenses are $2,000? Assume i=10%. I = $8,000B = $3,000O&M = $2,000 B/C = B/(I+O&M) = 3000/(8000(A/P,10%,8) ) = 0.85 Or B/C = (B- O&M)/I = ( )/(8000(A/P,10%,8)) = 0.66 How would your answer changes if a salvage value of $3,000 is expected B/C = B/(I-S+O&M) = 3000/ (8000(A/P,10%,8)- 3000(A/F,10%,8) +2000) = 0.92 Or B/C = (B-O&M)/(I-S) = ( )/ (8000(A/P,10%,8)- 3000(A/F,10%,8) = 0.8