Starting a 5 year double degree at Monash, student services offers a choice between 2 ways of paying for your school fees.
The first choice is for a fixed payments of $30,000 paid at the beginning of each year for 5 years.
The second choice is for a first payment of $25,000 paid at the end of your first year, increasing by 7% each year till your final year.
Using a discount rate of 10% p.a., which should you choose and what is the cost of that choice?
Choice 1:
P = Periodic payment = $30,000
n = 5 yeras
r = 10%
Present value of the choice = P + P[1 - (1+r)^(n-1)]/ r
= $30,000 + $30,000[1 - (1+10%)^(5-1)]/10%
= $30,000 + [$30,000 * 0.31698654463 / 0.10]
= $30,000 + $95095.96339
= $125,095.96
Choice 2:
P = First payment = $25,000
g = growth rate = 7%
n = 5 yeras
r = 10%
Present value of choice = [P / (r-g)] *[1 - ((1+g)/(1+r))^n]
=[$25,000 / (10%-7%)] * [1 - ((1+7%)/(1+10%))^5]
= $833,333.33333 * 0.12912572371
= $107,604.769762
=$107,604.77
Present value of 1st choice is $125,095.96
Present value of 2nd choice is $107,604.77
Therefore, 2nd choice should be selected
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