Question 1203425
4% * 6 mg = .24 mg of copper in 6 mg of metal 1.
80% * 2 mg = 1.6 mg of copper in 2 mg of metal 2.
total copper is 1.84 mg in total metal of 8 mg.
total copper percent of total metal = 1.84 / 8 * 100 = 23% copper in the combined metal alloy.