Eric sold cell phones for 70 dollars Eric increases his sale price by 100% what is the sales price of the cell phone

1 answer:

7 0

Current Price = $70

Percentage increase = 100% of $70 = $70

Sale Price = $70 + $70 = $140

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Answer: The sale price of the cell phone is $140.
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<u>Solution:</u>

Given that , In a certain function, y varies directly with x

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Now, from the given information,

$\begin{array}{l}{y \alpha x} \\\\ {y=c x \rightarrow(1)}\end{array}$

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$\begin{array}{l}{\text { Now, substitute } x=8 \text { and } y=6 \text { in }(1)} \\\\ {\rightarrow 8=c(6) \rightarrow c=\frac{8}{6}} \\\\ {\rightarrow c=\frac{4}{3}} \\\\ {\text { Then, }(1) \rightarrow x=\frac{4}{3} y} \\\\ {\text { So, when } y=9} \\\\ {\rightarrow x=\frac{4}{3}(9)} \\\\ {\rightarrow x=4 \times 3} \\\\ {\rightarrow x=12}\end{array}$

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