$39.60 is going be the discounted by 33% (or 0.33 in decimal form), so you're first going to find the discount amout:
$39.60*0.33= $13.068, which rounds up to $13.07
Since it's a discounted you're going to subtract this amount off from the original price ($39.60) to get the final price:
$39.60-$13.07=$26.53
so you final answer is $26.53
I hoped this help :)