during a sale , a shop allows discount of the marked price of clothing . What will a costumer pay for a dress with a marked price of $30?​

35 d

Step-by-step explanation:

 The correct option is (C) 220.

Step-by-step explanation:  Let, c, t and a represents the number of children, teenagers and adults that attended the concert.

Then, according t the given information, we have

Since number of teenagers is three-fourth of the number of children, so we have

So, from equations (i) and (ii), we get

and

Mutiplying equation (iii) by 5 and then subtracting equation (iv), we get

Therefore, from equation (III), we get

Thus, there are 220 adults who attended the concert.

Option (C) is correct.