The dinner check for a birthday party was $89.50. How do you estimate a 15% tip?

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The dinner check for a birthday party was $89.50. How do you estimate a 15% tip?

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Answer 1 · 2016-11-01T21:34:14

$15%$ of the bill is about $$13.50$

Explanation:

It is very easy to estimate $10%$ of any number - just divide by 10 by moving the decimal point one place to the left.

Once you know $10%$ of an amount, it is possible to find $5%$ by dividing the value that is $10%$ by 2. Adding these answers gives a quick estimate of $15%$

For example: "Find 15% of 300"

$10%$ of 300 = 30 and $30 div 2 = 15$

15% of 300 = 30+15 =45

In the same way for this question ...

Treat $89.50$ as $$90$ Find 10%, then 5%.

$10% +5% = $9+%4.50 = $13.50$

$15%$ of the bill is about $$13.50$

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The dinner check for a birthday party was $89.50. How do you estimate a 15% tip?

1 Answer

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