You have been saving your money to buy a new pair of shoes. Three different stores are having a sale on them. Which store has the best deal?

Store A
Original Price: $70
Take 10% off.
Then, take 10 percent off that price.

Store B
Original Price: $80 Take $15 off.
Then, take 10 percent off that price.

Store C
Original Price: $90
Take 10% off.
Then, take $20 off that price.
A) Store A
B) Store B
C) Store C