Respuesta :

Answer:

$18.9

Step-by-step explanation:

Diary of a Wimpy Kid

$6.30+$6.30+$6.30=18.9 cause you are giving 30% off

Answer:

$21

Step-by-step explanation:

30% of $n = $6.30

$6.30/30% = $0.21

$0.21 * 100% = $21