An individual wishes to deposit an amount of money now and $100 every six months so that at the end of five years $1,650 will have been accumulated. With interest at 4% per year, compounded semiannually, how much should be deposited now?
A. $455.35
B. $510.95
C. $332.24
D. $284.51
Answer:_________________
Show work
Solution:-
Let the amount deposit now is = X
Therefore 100 deposit at every 6 month
Accumulated amount after 5 year is $1650
Interest rate 4% per year, compounded semi-annually
$1650 = X (1 + 0.04/2) ^ (5*2) + 100{(1 + 0.04/2) ^ (5*2) – 1 / i/2}
$1650 = X (1 + 0.04/2) ^ 10 + 100{(1 + 0.04/2) ^ 10 – 1 / 0.04/2}
$1650 = X (1.2190) + 100{1.2190 – 1 / 0.02}
$1650 = X (1.2190) + 100{10.95}
$1650 = X1.2190 + 1095
$1650 - 1095 = X1.2190
$558 = X1.2190
X = $558 / 1.2190
X = $457.75
So the answer is (A) $455.35
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