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4 years ago

10

A plane increases its cruising speed from 400mph to 550mph. Work out the percentage speed increase.

1 answer:

Harlamova29_29 [7]4 years ago

4 0

Well, it went from 400 to 550, so the difference is 150.

if we take 400 to be the 100%, what is 150 off of it in percentage?

$\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
400&100\\
150&p
\end{array}\implies \cfrac{400}{150}=\cfrac{100}{p}\implies p=\cfrac{150\cdot 100}{400}$

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