The percentage of his tip compared to the cost of the iced coffee drink is 17.57%.
Percentage is defined as part of a whole expressed in hundredths or out of 100. It is usually written with the symbol "%".
To determine the percentage, we must first determine the proportion of the amount of the tip compared to the cost of the drink he purchased by dividing the two values. After that, multiply the answer by 100.
percentage = (amount of the tip/cost of the iced coffee drink) x 100
percentage = ($1/$5.69) x 100
percentage = 0.175747 x 100
percentage = 17.57%
Hence, he tip 17.57% of what he purchased.
Learn more about percentage here: brainly.com/question/843074
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