Cost of an oil change: $19.95 Discount: 33% What is the new cost?

Mathematics

2 answers:

marysya [2.9K]2 years ago

5 0

Answer:

$13.95

Step-by-step explanation:

valina [46]2 years ago

3 0

Answer:

The new cost is 13.37

Step-by-step explanation:

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$\bf \qquad \textit{Compound Interest Earned Amount}
\\\\
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\quad 
\begin{cases}
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\begin{array}{llll}
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\end{array}\to &1\\
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\end{cases}
\\\\\\
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$\bf \qquad \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}\to &\$4329.73\\
r=rate\to 8\%\to \frac{8}{100}\to &0.08\\
n=
\begin{array}{llll}
\textit{times it compounds per year}\\
\textit{annually, thus once}
\end{array}\to &1\\
t=years\to &7
\end{cases}
\\\\\\
A=4329.73\left(1+\frac{0.08}{1}\right)^{1\cdot 7}\implies A=4329.73(1.08)^7\\\\\\ A\approx 7420.396$

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