The mark up amount was first computed and then added to the cost of the comic book, the final amount after mark up is
$5.79
Given Data
Let us find 45% of 3.99
= 45/100*3.99
= 0.45*3.99
= 1.7955
The Mark up amount is $1.7955
Let us find the final price after mark up amount is added
= 1.7955+3.99
= $5.7855
Approx = $5.79
Learn more about percentage here:
https://brainly.com/question/24304697