Suppose a firm's production function is given by q = 2L + 2K. The firm's target level of output is 20. Suppose that the wage rate is $5 per hour...

Suppose a firm’s production function is given by q = 2L + 2K. The firm’s target level of output is 20. Suppose that the wage rate is $5 per hour whereas the rental rate is $10 per hour. Calculate the firm’s cost-minimizing input combination and the corresponding minimum cost. On a diagram, show the expansion path of this firm and explain its shape.