emergency please !!!

A process engineer can produce an item using Machine A or B. Machine A has fixed cost of $3000 for tooling and a variable cost of $4 per unit. Machine B requires a special machine with a fixed cost of $21,000 and a variable cost of $1 per piece. How many units should be produced to get less cost in Machine B than A?

Select one:

a. 4750

b. 6000

c. 5000

d. 4500

e. 4000

f. 3500

A company has annual demand of 16000 tons of coal to be used for production. The setup cost for each order of coal is $500 and the inventory holding cost is 1 $/ton-year and company works 300 days each year. Find the total cost of the order, time between orders, and number of orders given each year?

Select one:

a. total cost=8000, time between orders= 60, number of orders = 5

b. total cost=4000, time between orders= 75, number of orders = 4

c. total cost=6000, time between orders= 100, number of orders =3

d. total cost=6400, time between orders= 100, number of orders =3

e. total cost=4000, time between orders= 120, number of orders = 4

f. total cost=7200, time between orders= 100, number of orders =3