Final answer:
To calculate the selling price of the necklace, add the cost price to the desired profit percentage. In this case, the selling price is $19.22.
Step-by-step explanation:
To calculate the selling price, we need to determine the cost of making the necklace and add the desired profit percentage. In this case, the cost of making the necklace is $12.40.
To find the selling price, we can use the formula:
Selling price = Cost price + Profit
Since Sylvia wants to make a 55% profit, we can calculate the profit amount:
Profit = 55% of Cost price
Substituting the given values:
Profit = 55% of $12.40 = $6.82
Now we can calculate the selling price:
Selling price = $12.40 + $6.82 = $19.22