Final answer:
To find the percentage of Karen's total purchase that was spent on fantasy books, divide the amount spent on fantasy books by the total purchase amount and multiply by 100.
Step-by-step explanation:
To find the percentage of Karen's total purchase that was spent on fantasy books, we need to calculate the ratio of the amount spent on fantasy books to the total purchase amount. The total purchase amount is the sum of the amounts spent on all the books. In this case, it is $11 + $24 + $17 + $5 = $57. The amount spent on fantasy books is $11. To find the percentage, we divide the amount spent on fantasy books ($11) by the total purchase amount ($57) and multiply by 100:
Percentage = (Amount spent on fantasy books / Total purchase amount) x 100
Percentage = ($11 / $57) x 100 = 19.3%
So, to the nearest whole number, approximately 19% of Karen's total purchase was spent on fantasy books.