If you answer both ill give brainliest.

A hardware store sells a 5-pound box of nails for $16.80. The store is having a 20 percent off sale on all merchandise. What is the sale price of one 5-pound box of nails?
A.$13.44
B.$13.46
C.$14.34
D.$14.46

A backpack costs $18 and has a 7 percent tax. How much will Sheila have to pay for the backpack after tax?
A.$1.26
B.$12.60
C.$19.26
D.$30.60