Red gold is a gold-copper alloy used to make jewelry. A piece of jewelry made of red gold weighs 7.43 g and has a volume of
0.476 cm³. Gold has a density of 19.3 g/cm³ and copper has a density of 8.96 g/cm³. Calculate the percentage by mass of each
metal in the jewelry. Assume the total volume of the jewelry is the sum of the volumes of the two metals it contains.