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1 year ago

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Wynona buys some new boots that are priced $85.79. She gets successive discounts of 10% followed by 5% off on the boots. The pur

chase price of Wynona’s boots is _____ of the original price. a. 84% b. 84.5% c. 85% d. 85.5%

2 answers:

ddd [48]1 year ago

7 0

the correct answer is D

djverab [1.8K]1 year ago

4 0

we know that

the original price is $\$85.79$

The original price represent the $100\%$

so

1) First discount of $10\%$

Find the new price 1

$\$85.79*(1-0.10)=\$77.21$

2) Second successive discount of $5\%$

Find the new price 2

$\$77.21*(1-0.05)=\$73.35$

3) Find by proportion the total percentage of discount

$\frac{100}{85.79} \frac{\%}{\$} =\frac{x}{73.35} \frac{\%}{\$} \\ \\x=100*73.35/85.79 \\ \\x=85.5 \%$

therefore

<u>the answer is the option D</u>

$85.5 \%$

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Answer:

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C. open at both ends.

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The right choice is:

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Step-by-step explanation:

Given:

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We have to find whether the pipe is open,closed or open-closed or none.

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The fundamental wavelength of a pipe which is open at both ends is 2L.
The fundamental wavelength of a pipe which is closed at one end and open at another end is 4L.

So,

The fundamental wavelength:

⇒ $4L=4(120)=480\ cm$

It seems that the pipe is open at one end and closed at one end.

Now lets check with the subsequent wavelengths.

For one side open and one side closed pipe:

An odd-integer number of quarter wavelength have to fit into the tube of length L.

⇒ $\lambda_2=\frac{4L}{3}$ ⇒ $\lambda_3=\frac{4L}{5}$

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1 year ago

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Step-by-step explanation:

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