Answer:
the new selling price would be 15 + 6.75 = $<<15+6.75=21.75>>21.75.
Explanation:
To calculate the markup on the necklace, you need to first calculate the amount of the markup by multiplying the cost of the necklace by the markup percentage. In this case, the markup would be 15 * 0.45 = $<<15*0.45=6.75>>6.75.
To determine the new selling price of the necklace, you would then add the markup to the cost of the necklace. So the new selling price would be 15 + 6.75 = $<<15+6.75=21.75>>21.75.