Thelma must deposit $11,270 today, at an interest rate of 8 percent, for her son to be able to withdraw $5,000 per year for four years of college.
Present value refers to the value of the investment today rather than nearest future.
We can assume the amount to be invested is y
Rate of interest = 8%
Therefore, the amount accumulated after 5 year is
= y * 1.08^5
Since the son withdraws 5,000 per year for 4 years
The present value of those withdrawals from now
= 5,000/1.08 + (5,000/1.08)^2 + (5,000/1.08)^3 + (5,000/1.08)^4
= 16560.63
Now, the amount accumulated after 5 years
= Value of 4 withdrawals at year 5
= 1.08^5y = 16560.63
y = $11,270
Hence, Thelma must deposit $11,270 today, at an interest rate of 8 percent, for her son to be able to withdraw $5,000 per year for four years of college.
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