The unit quantity standard of a product is 3 pounds per package, and the unit quantity standard for machine hours is 0.40 hours per package. During August, 180,000 packages were produced. 400,000 pounds and 84,000 hours were used in production. How many pounds and how many machine hours should have been used for the actual output?

a. 540,000 pounds and 72,000 hours

b. 540,000 pounds and 84,000 hours

c. 400,000 pounds and 72,000 hours

d. 400,000 pounds and 84,000 hours