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Question text Find the PV of an annuity, which starts at $1 per year (payable at...

Question text

Find the PV of an annuity, which starts at $1 per year (payable at the end of the year) and increases by $1 per year to a value of $15, then decreases by $1 per year to the final payment of $1. Assume i = 0.07

Solutions

Expert Solution

PV is calculated as follows

Year CF Discount Factor Discounted CF
1 $   1.00 1/(1+0.07)^1= 0.934579439 0.934579439252336*1=     0.93
2 $   2.00 1/(1+0.07)^2= 0.873438728 0.873438728273212*2=     1.75
3 $   3.00 1/(1+0.07)^3= 0.816297877 0.816297876890852*3=     2.45
4 $   4.00 1/(1+0.07)^4= 0.762895212 0.762895212047525*4=     3.05
5 $   5.00 1/(1+0.07)^5= 0.712986179 0.712986179483668*5=     3.56
5 $   6.00 1/(1+0.07)^5= 0.712986179 0.712986179483668*6=     4.28
7 $   7.00 1/(1+0.07)^7= 0.622749742 0.622749741884591*7=     4.36
8 $   8.00 1/(1+0.07)^8= 0.582009105 0.582009104565038*8=     4.66
9 $   9.00 1/(1+0.07)^9= 0.543933743 0.543933742584148*9=     4.90
10 $ 10.00 1/(1+0.07)^10= 0.508349292 0.508349292134718*10=     5.08
11 $ 11.00 1/(1+0.07)^11= 0.475092796 0.475092796387587*11=     5.23
12 $ 12.00 1/(1+0.07)^12= 0.444011959 0.444011959240735*12=     5.33
13 $ 13.00 1/(1+0.07)^13= 0.414964448 0.414964447888538*13=     5.39
14 $ 14.00 1/(1+0.07)^14= 0.387817241 0.387817241017325*14=     5.43
15 $ 15.00 1/(1+0.07)^15= 0.36244602 0.36244601964236*15=     5.44
16 $ 14.00 1/(1+0.07)^16= 0.338734598 0.338734597796598*14=     4.74
17 $ 13.00 1/(1+0.07)^17= 0.31657439 0.31657439046411*13=     4.12
18 $ 12.00 1/(1+0.07)^18= 0.295863916 0.295863916321598*12=     3.55
19 $ 11.00 1/(1+0.07)^19= 0.276508333 0.276508333010839*11=     3.04
20 $ 10.00 1/(1+0.07)^20= 0.258419003 0.258419002813869*10=     2.58
21 $   9.00 1/(1+0.07)^21= 0.241513087 0.241513086741933*9=     2.17
22 $   8.00 1/(1+0.07)^22= 0.225713165 0.225713165179377*8=     1.81
23 $   7.00 1/(1+0.07)^23= 0.210946883 0.210946883345212*7=     1.48
24 $   6.00 1/(1+0.07)^24= 0.19714662 0.197146619948796*6=     1.18
25 $   5.00 1/(1+0.07)^25= 0.184249178 0.18424917752224*5=     0.92
26 $   4.00 1/(1+0.07)^26= 0.172195493 0.172195493011439*4=     0.69
27 $   3.00 1/(1+0.07)^27= 0.160930367 0.16093036730041*3=     0.48
28 $   2.00 1/(1+0.07)^28= 0.150402212 0.15040221243029*2=     0.30
29 $   1.00 1/(1+0.07)^29= 0.140562815 0.140562815355411*1=     0.14
PV = Sum of all Discounted CF 89.04

PV comes to 89.04


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