The image contains a question that asks for the total cost after a 50% discount is applied to a price of $35. To solve this:

1. Find the discount amount:
   50% of $35 = 0.50 × 35 = $17.50.

2. Subtract the discount from the original price to find the total cost:
   $35 - $17.50 = $17.50.

So, the correct answer is $17.50.

If you would like further clarification or have any questions, feel free to ask!

Here are some related questions you might find helpful:

1. How do you calculate a 20% discount on a price of $50?
2. What if the original price were $100, and a 25% discount was applied?
3. How would you calculate the total price after adding a sales tax of 8% to a discounted price?
4. How do you determine the percentage discount when the original price and the final price are given?
5. What is the difference between a flat discount and a percentage discount?

Tip: Always remember to first calculate the discount and then subtract it from the original price to find the final cost.