Answer :
In order to determine the total cost of Amiras's lunch, it is necessary to add to the initial cost of $14.50 the amount related to the tip of 20%.
Calculate the 20% of $14.50, by multiplying the factor 20/100 by 14.50:
[tex](\frac{20}{100})(14.50)=2.9[/tex]20% of $14.50 is $2.9.
Hence, the total cost of the lunch was:
[tex]14.50+2.9=17.4[/tex]$17.4