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Question 75 ptsNeeki's parents gave her some money as a gift and she deposit all of it in a bankthat pays 6% annual interest compounded quarterly. After 15 years her balanceis $21,000.How much money as a gift her parents gave him.Use six digits after decimal when calculating.For your final answer, round to two digits after decimal.Select the closest answer

Sagot :

ANSWER

$8,595.21

EXPLANATION

The compound interest formula is,

[tex]A=P\left(1+\frac{r}{n}\right)^{nt}[/tex]

Where P is the deposited amount, r is the interest rate, n is the number of times the interest is compounded per year, t is the time in years, and A is the balance after t years.

We have to find P, so we have to solve the equation above for P,

[tex]P=\frac{A}{\left(1+\frac{r}{n}\right)^{nt}}[/tex]

We have that:

• A = $21,000

,

• r = 0.06

,

• n = 4 (the interest is compounded quarterly)

,

• t = 15 years

Replace the known values and solve,

[tex]P=\frac{21,000}{\left(1+\frac{0.06}{4}\right)^{4\cdot15}}=\frac{21,000}{(1+0.015)^{60}}=\frac{21,000}{1.015^{60}}=\frac{21,000}{2.443220}\approx8595.21[/tex]

Hence, her parents gave her $8,595.21.