The Jewelry Company makes and sells jewelry. For one type of necklaces, the company uses clay beads and glass beads. There are no more than 10 clay beads and at least 4 glass beads per necklace. Four times the number of glass beads is less than or equal to 8 more than twice the number of clay beads. Each clay bead costs $0.20 and each glass bead costs $0.40. Find the minimum cost to make a necklace with clay and glass beads and find the combination of clay beads and glass beads that yields the minimum cost. Define variables and write inequalities to represent the constraints. Then write an equation for the cost, C.