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If $300 is invested at a rate of 5% per year and is compounded quarterly, how much will the investment be worth in 15 years?

Use the compound interest formula A equals P times the quantity 1 plus r divided by n end quantity raised to the power of n times t.


Sagot :

[tex]~~~~~~ \textit{Compound Interest Earned Amount} \\\\ A=P\left(1+\frac{r}{n}\right)^{nt} \quad \begin{cases} A=\textit{accumulated amount}\\ P=\textit{original amount deposited}\dotfill &\$300\\ r=rate\to 5\%\to \frac{5}{100}\dotfill &0.05\\ n= \begin{array}{llll} \textit{times it compounds per year}\\ \textit{quarterly, thus four} \end{array}\dotfill &4\\ t=years\dotfill &15 \end{cases} \\\\\\ A=300\left(1+\frac{0.05}{4}\right)^{4\cdot 15}\implies A=300(1.0125)^{60}\implies A\approx 632.15[/tex]

The investment after 15 years by the given rate of interest will be around $632.15.

What is compound interest?

Compound interest is applicable when there will be a change in principle amount after the given time period.

For example, if you give anyone $500 at the rate of 10% annually then $500 is your principle amount. After 1 year the interest will be $50 and hence principle amount will become $550 now for the next year the interest will be $550, not $500.

Given,

Principle amount(P)  = $300

Rate of interest (R) = 5%

Time period (T) = 15 years

The compound interest formula is given by

A = P[tex][ 1 + 0.0R/n]^{nT}[/tex]

So,

A = 300 [ 1 + 0.05/4] to the power of 4(15)

A = 300[1.0125]⁶⁰

A = $632.1544 ≈ $632.15.

Hence "The investment after 15 years by the given rate of interest will be around $632.15".

For more information about compound interest

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