a.
Formula for compound interest,
A = P x (1+r/n) nt
A = Amount of money accumulated after year n
P = Principal amount = $ 8,000
r = Annual rate of return = 12 % or 0.12
n = Annual compounding frequency = 12
t = Number of years amount is deposited = 4
Substituting all the values on above formula, we get A as:
A = $ 8,000 x (1+0.12/12)48
= $ 8,000 x (1+0.01)48
= $ 8,000 x (1.01)48
= $ 8,000 x 1.61222607768247
= $ 12,897.8086214597 or $ 12,897.81
After 48 months, there will be $ 12,897.81 in the accounts.
b.
Return on investment = Total accumulated amount – Principal amount
= $ 12,897.81 - $ 8,000 = $ 4,897.81
c.
Principal amount of deposit can be computed using formula for compound interest as:
A = P x (1+r/n) nt
P = A/(1+r/n) nt
= $ 20,000/ (1+0.01)48
= $ 20,000/ (1.01)48
= $ 20,000/ 1.61222607768247
= $ 12,405.2081013039 or $ 12,405.21
We need to deposit $ 12,405.21 to get $ 20,000 after 48 months.
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