Shawn makes bracelets using stone beads. He buys beads for $0.30 each. The wire used to make each bracelet costs $0.10.
a) Write an equation to find the cost (c) to make a bracelet with b beads.
b) one of shawn's popular bracelets, the Charmer, includes 15 stone beads. Another bracelet, the sparkler, uses 20 beads. how much does it cost to make each bracelet?
I have no idea how to do this!