Which store will she purchase the rug from

Store a: 10% of 45 is 4.5 45-4.5=40.5- can’t get this one with or without tax bc she only has $40 to spend
store b: 45-10=35 35+6% tax= 37.10- can afford with tax and would have $2.93 left over
the correct answer would be c

Just turn the whole gym into pie