A widget manufacturer has an infinitely substitu-table production function of the form

q = 2K + L

a. Graph the isoquant maps for q = 20, q = 40, and q = 60. What is the RTS along these iso-quants?

b. If the wage rate (w) is $1 and the rental rate on capital (v) is $1, what cost-minimizing combination of K and L will the manufacturer employ for the three different production levels in part a? What is the manufacturer's expansion path?

c. How would your answer to part b change if v rose to $3 with w remaining at $1?