Answer:
Step-by-step explanation:
It is given that:
Jill had $90.
i.e. the amount she spent on buying skirt=42/2= $ 21.
Let x be the regular price of T-shirt.
i.e. the amount she spent on T-shirt=x-8.
Before sales tax, the total cost of the clothes was $31.
Hence, total cost=cost of skirt+ cost of t-shirt
i.e. 31=21+x-8
i.e. 21+x-8=31
i.e. 21-8+x=31
⇒ 13+x=31
⇒ x=31-13
⇒ x=18.
Hence, the regular price of t-shirt is $18.
We are asked to find the regular price of the t-shirt?