Solution - Percentage

72

See steps

Step-by-step explanation

1. Convert percentages into fractions or decimals

For fraction: divide 80 by 100 and remove the % sign.
$80 % = \frac{80}{100}$

For decimal: move the decimal point 2 places to the left and remove the % sign.
$80 % = 0.8$

2. Multiply the decimal or fraction by the quantity that equals 100%

$100 % = 90$
$\frac{80}{100} \cdot 90 = 0.8 \cdot 90 = 72$

80% of 90 is 72

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Why learn this

"Only today- 55% off on all shoes!"
"The interest has gone up by 0.7%."
"20% tip is included in the bill."

Percentages are really useful ways to understand how numbers are related. They show up constantly in everyday life - from shopping to using the internet, important statistics and beyond - so understanding them is 100% worth the time commitment.

Terms and topics

Percentages