Amerchant sold an item for $18.50. if 30% of the selling price was profit, how much profit did the merchant make on the sale?

Adolphin is swimming with her friend. the dolphin jumps to a height of 4.54.54, point, 5 meters above the surface of the water as her friend swims 9.89.89, point, 8 meters directly below her. what is the position of the dolphin's friend relative to the surface of the water? meters