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3 years ago

9

By what percent did the price change, if… a the price was $100 and now it is $250?

2 answers:

elena-s [515]3 years ago

7 0

It had a 150% increase in price

100* 1.5 = 150
150+100 = 250

Naddik [55]3 years ago

4 0

Well, if we take $100 to be the 100%, and then it went up by $150, how much is $150 off of it in percentage?

$\bf \begin{array}{ccll}
\$&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
100&100\\
150&x
\end{array}\implies \cfrac{100}{150}=\cfrac{100}{x}\implies x=\cfrac{150\cdot 100}{100}$

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Step-by-step explanation:

Given: A baker is using a cookie that calls for 2 $\frac{1}{4}$ cups of flour to yield 36 cookies.

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Let "x" be the amount flour to make 90 cookies

<u>Amount of Flour</u> <u>Number of cookies</u>

$\frac{9}{4}$ 36

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Now form a proportion.

$\frac{\frac{9}{4}}{x} = \frac{36}{90}$

Now let's cross multiply, we get

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Now let's simplify the fraction part, Here the GCF of 90 and 144 is 18, so dividing the fraction's numerator and the denominator by 18, we get

x = $5 \frac{5}{8}$ cups

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