12. Production estimates for August are as follows: Estimated inventory (units), August 1 12,000 Desired inventory (units), August 31 9,000 Expected sales volume (units), August 75,000 For each unit produced, the direct materials requirements are as follows: Direct material A ($5 per lb.) 3 lbs. Direct material B ($15 per lb.) 1/2 lb. The total direct materials purchases of materials A and B required for August production is a. $1,260,000 for A; $630,000 for B b. $1,080,000 for A; $540,000 for B c. $1,125,000 for A; $562,500 for B d. $1,170,000 for A; $585,000 for B