Final answer:
To find the selling price, multiply the cost price by the markup percentage and add it to the cost price.
Step-by-step explanation:
To find the selling price, we need to calculate the markup amount and add it to the cost price. First, calculate the markup amount by multiplying the cost price by the markup percentage:
Markup amount = $15 x 85% = $12.75
Next, add the markup amount to the cost price to find the selling price:
Selling price = $15 + $12.75 = $27.75