SOLUTION: what is an everyday formula that we use in real life. please give formula and explanation.

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Question 231090: what is an everyday formula that we use in real life. please give formula and explanation.
Answer by unlockmath(1688) About Me  (Show Source):
You can put this solution on YOUR website!
Hello,
Here's one we use quite often when we walk into a store that has a sale.
Let's say you want to buy shoes at $90 and there is a sale of 30%. How much do you save?
Formula is:
30% times $90 = savings
This can be rewritten as:
(.30)($90)= ?
So therefore the answer is:
$27.00 saved on the pair of shoes.
RJ Toftness
Author of "Unlock the Mystery to Math"
www.math-unlock.com