3 years ago

If pablo invests $4,200 for 3 years and earns $630, what is the simple interest rate?

Mathematics

1 answer:

Naya [18.7K]3 years ago

4 0

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Answer:

Breyana paid 88% of the dress's original price.

Step-by-step explanation:

We are given the following in the question:

Let x be the original price of dress.

The dress is on sale for 20%.

Price of dress after discount =

$(x-0.20x)$

Breyana will also have to pay 10% sales tax on the discounted price of the dress.

Price of dress after discount =

$0.10(x-0.20x)$

Total cost of dress =

$(x-0.20x) + 0.10(x-0.20x)$

We have to calculate percentage of original price paid by Breyana

$\dfrac{(x-0.20x) + 0.10(x-0.20x)}{x}\times 100\%\\\\=\dfrac{0.80x+0.08x}{x}\times 100\%\\\\=\dfrac{0.88x}{x}\times 100\%\\\\=88\%$

Thus, Breyana paid 88% of the dress's original price.

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We have the formula:

$M=S-N$

where M is the mark down, S is the original price and N is the reduced price. Plugging the values we know:

$\begin{gathered} 9.28=S-6.67 \\ S=9.28+6.67 \\ S=15.95 \end{gathered}$

Therefore the original price was $15.95

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Step-by-step explanation:

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