Question

john buys 8 packs of cookies at the grocery store. the cookies are on sale for 50 cents off per pack. he spends $20. which equation can be used to find the original cost of a box of cookies, c? (1 point)

8 (c + 0.50) = 20

8c - 0.50 = 20

8 (c - 0.50) = 20

8 - 0.50c = 20

Explanation:

Step1: Define cost per - pack after discount

The original cost of a pack of cookies is $c$. The discount per pack is $0.50$ dollars. So the cost per pack after discount is $c - 0.50$.

Step2: Calculate total cost

John buys 8 packs. The total amount he spends is the number of packs times the cost per pack after discount. So the total cost is $8(c - 0.50)$. And we know he spends $20$ dollars. So the equation is $8(c - 0.50)=20$.

Answer:

$8(c - 0.50)=20$ (the third option)