An item has a regular price of $75 at three different stores. each store has a different offer for the item.

store a is offering 15% off the regular price of the item.
store b is offering a coupon for $15 off the regular price of the item.
store c is offering a $15 mail-in rebate when you buy the item at a regular price.

which store is offering the best deal?

a. store a

b. store b

c. store
( make sure you answer is 100% accurate)