pls help i will thumb up

Solman Corporation makes a part that is used in the manufacture of one of its products Blue Company has offered to sell 6,000 units of the same part to Soliman Corporation for A. Make the part and save $6.30 per unit B. Make the part and save $2.70 per unit C. Buy from Suri and save $1.60 per unit D. Make the part and save $10.30 per unit anufacture of one of its products. The unit manufacturing costs of this part; assuming a production level of 6,000 units, are as follows