Amazon receives 5% of the cost of all sales made on their website. How much does Amazon make on a shoes sale of $80?

If Amazon gets 5% of each sale they make, find 5% of the $80 sale. You have to convert 5% to a decimal, which is 0.05. → 80 * 0.05 is $4 which means that if they sell something for $80, Amazon will recieve $4.