make a cross over chart

Chapter 7 and 75 Homework Ski Boards Inc. has 3 choices: Refurbish old equipment at a cost of $800 with variable cost per board at $1.10 Make major modifications at a cost of $1,100 with variable cost per board at $0.70 Purchase new equipment at a cost of $1,800 with variable cost per board at $0.40 Graph the cost lines and determine the volume requirements for each choice where costs are the lowest