A thin circular disk earring 5.05 cm in diameter is plated with a coating of gold 0.13 mm thick from an Au3+ bath. How many days does it take to deposit the gold on one side of one earring if the current used is 0.024 A? (d of gold = 19.3 g/cm3.)If the price of gold is $340. per troy ounce (31.10 g), what is the total cost of the gold plating?