Answer:
What was the regular price of the T-shirt?
What question is being asked in this word problem?
What is the regular price of the skirt?
How much money does Jill have left?
How much does the T-shirt normally cost?
What is the amount Jill pays in sales tax?
Step-by-step explanation:
skirt $21
t-shirt = p - $8
before sales tax, total cost was $31
$21 + p - $8 = $31
p = $18