Which of the following is an example of a rebate offered to buyers?
a. Getting $25 off a $100 purchase on exchange of a used product.
b. Getting $3 off a $100 purchase for paying the bill within 10 days.
c. Getting $5 returned by mail after a $100 purchase for making the purchase.
d. Getting $100 off a $1,000 purchase for buying in bulk quantities.
Answer: C