Answer: more than 152.5 cookies
Explanation:
$15.25/$0.10=152.5(multiple)
so if you sell 152.5 pieces of cookies, you'll neither gain nor lose.
if you want to make a profit, the number of cookies must higher than 152.5.
if x =the number of cookies you can make a profit. Then x>152.5
it can be 153, 154, 155.....................(pieces)
but it can't be 153.5, 167.2...................(pieces)(must be an integer)