Chau sells beaded necklaces. Each large necklace sells for 6.40 and each small necklace sells for 4.80. How much will he earn from selling 5 large necklaces and 5 small necklaces?
From selling 5 large necklaces, Chau will earn 5 * 6.40 = 32.
From selling 5 small necklaces, Chau will earn 5 * 4.80 = 24.
Therefore, Chau will earn 32 + 24 = $56 from selling 5 large necklaces and 5 small necklaces.