Carla's profit per cookie is $0.10 - cost per cookie. To break even, she needs to sell enough cookies to cover her costs, so:
$9.75 ÷ $0.10 = 97.5
Since she can't sell half a cookie, she needs to round up to the nearest whole number. Therefore, she needs to sell at least 98 cookies to make a profit.
Answer: At least 98 cookies.