Tammy bought 16 cookies for a

party. She had 6 cookies decorated at an extra
cost of 25 cents each. If the total cost of the
cookies was $9.50, how much did each plain
cookie cost?

6 * 0.25 = $1.50

$9.50 - 1.50 = $8.00

8/16 = 0.50

To find out how much each plain cookie cost, we need to subtract the cost of the decorated cookies from the total cost and then divide that value by the number of plain cookies.

First, let's calculate the cost of the decorated cookies. Tammy had 6 cookies decorated at an extra cost of 25 cents each. So, the cost of decorated cookies would be 6 * $0.25 = $1.50.

Next, subtract the cost of decorated cookies from the total cost of $9.50. $9.50 - $1.50 = $8.00.

Now, we know that the remaining $8.00 represents the cost of the plain cookies. Tammy bought 16 cookies in total, out of which 6 were decorated. So, the number of plain cookies would be 16 - 6 = 10.

Finally, divide the cost of plain cookies ($8.00) by the number of plain cookies (10) to find the cost of each plain cookie. $8.00 ÷ 10 = $0.80.

Therefore, each plain cookie costs $0.80.