Answer quickly!

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.

how much profit does lucy earn when she sells a necklace?

what fraction of the sale price of the necklace is profit? record your answer as a fraction using whole numbers.

what decimal of every dollar of the sale price of the necklace is profit? show your work. round your answer to the nearest hundredth.

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.