When a firm uses 9 hours of machine time and 9 hours of labor, its total output is 420 units.When it uses 9 hours of machine time and 10 hours of labor, its total output is 440 units.If it costs the firm $15 for each hour of machine time, $20 for each hour for labor, and the firm's output sells for $25 per unit, what is the VMPL?

Group of answer choices

$20

$25

$335

$15

$35

None of the answers listed is correct

A firm's production function is Q = 60K1/3L1/2.The firm rents machinery (capital) for 27 hours.The selling price of the output is $8.The wage rate is $24 per hour.How many hours of labor should the firm hire?

Group of answer choices

900

1,000

640

1. 720