Lucy has a jewelry business. to make a certain necklace, she spends $3.38 on materials and $5.57 on labor. she then sells the necklace for $15.99. lucy’s profit on the necklace is equal to the sale price minus the cost of materials and labor. (a) how much profit does lucy earn when she sells a necklace? (b) what percent of the sale price is profit? show your work. round your answer to the nearest hundredth of a percent. (c) lucy collected $223.86 selling necklaces at a craft fair. how many necklaces did lucy sell? how much profit did she earn? show your work.