Final answer:
The selling price for the duck float is $13.95.
Step-by-step explanation:
To find the selling price, we need to add the markup percentage to the original cost.
First, calculate the markup amount by multiplying the original cost ($9.30) by 50% (0.50) which equals $4.65.
Then, add the markup amount to the original cost to get the selling price. So, the selling price for the duck float is $9.30 + $4.65 = $13.95.