Answer:
$9 before tip
Step-by-step explanation:
Let's find the price of Mira's breakfast.
Ususally a tip is calculated by a defined percentage, and it means that from the actual price of the breakfast you add to the bill a X% of the price.
This means that if your breakfast price is Y, the tip (T), using a X percentage for tip, can be calculated as:
T=Y*(X/100); notice how 'tip percentage' (X) is divided by 100 to convert a percentage number into a decimal number.
In the given problem, Mira uses a 20% 'percentage tip' which means X=20. Also, Mira leaves a $1.80 'tip' which means T=$1.8.
Now, the problem asks the price of the breakfast (Y), so using the previous equation, we have:
T=Y*(X/100)
$1.80=Y*(20/100)
$1.80*100/20=Y
$9=Y
In conclusion, the price of Mira's breakfast is $9 before tip.
