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4 years ago

13

What is $2.50 marked up by 15%?

2 answers:

Rainbow [258]4 years ago

4 0

$2.50 marked up 15% would be $2.88. When you take 15% of 2.50 you get .375 which when you add to 2.50 you get 2.875. After rounding to the nearest cent you would get a total of $2.88. Hope this helps!

GaryK [48]4 years ago

4 0

2.50 + 15%= 2.875

it's a mark up of 0.375

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Answer:

We are given that Among 180 homes in Hyde Park, 25 were found to have unsafe radon levels. Among 230 homes in La Grange, 50 were found to have unsafe radon levels.

Claim : the two towns have different rates of unsafe radon levels.

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So, $n_1=180, y_1=25$

Among 230 homes in La Grange, 50 were found to have unsafe radon levels.

So, $n_2=230, y_2=50$

We will use Comparing Two Proportions

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$\widehat{p_1}=\frac{25}{180}$

$\widehat{p_1}=0.1388$

$\widehat{p_2}=\frac{y_2}{n_2}$

$\widehat{p_2}=\frac{50}{230}$

$\widehat{p_2}=0.217$

$\widehat{p}=\frac{y_1+y_2}{n_1+n_2} =\frac{25+50}{180+230}=0.1829$

Formula of test statistic : $\frac{\widehat{p_1}-\widehat{p_2}}{\sqrt{\widehat{p}(1-\widehat{p})(\frac{1}{n_1}+\frac{1}{n_2})}}$

Substitute the values

test statistic : $\frac{0.138-0.217}{\sqrt{0.1829(1-0.1829)(\frac{1}{180}+\frac{1}{230})}}$

test statistic : −2.053

Refer the z table for p value

p value = 0.0202

α= 0.05

Since p value < α

So, we reject the null hypothesis that the two towns have same rates of unsafe radon levels.

So, Claim is true.

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