Answer to Question 8.
Answer a.
Desired sum after 4 years = $20,000
Interest rate = 6%
Let annual deposit at the end of each year be $x
$x*1.06^3 + $x*1.06^2 + $x*1.06 + $x = $20,000
$x * (1.06^4 - 1) / 0.06 = $20,000
$x * 4.3746 = $20,000
$x = $4,571.85
So, annual deposit at the end of each year is $4,571.85
Answer b.
Desired sum after 4 years = $20,000
Interest rate = 6%
Let annual deposit at the beginning of each year be $x
$x*1.06^4 + $x*1.06^3 + $x*1.06^2 + $x*1.06 = $20,000
$x * 1.06 * (1.06^4 - 1) / 0.06 = $20,000
$x * 4.6371 = $20,000
$x = $4,313.06
So, annual deposit will decrease by $258.79 ($4,571.85 - $4,313.06)
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