A company processes raw material into products F1, F2, and F3.

Each ton of raw material produces five units of F1, two units of F2, and three units of F3.

Joint processing costs to the split-off point are USD 15 per ton.

Further processing results in the following per unit figures:

Additional processing costs per unit:

F1 USD 28

F2 USD 30

F3 USD 25

Selling price per unit:

F1 USD 30

F2. USD 35

F3 USD 35

If joint costs are allocated by the net realizable value of finished product, what proportion of joint costs should be allocated to F1?

a. 33.33 percent

b. 30 percent

c. 20 percent

d. 50 percent