Production estimates for August are as follows: Estimated inventory (units), August 1 Desired inventory (units), August 31 Expected sales volume (units), August 12,000 9,000 75,000 For each unit produced, the direct materials requirements are as follows: Material A ($5 per lb.) Material B ($18 per lb.) 3 lbs 1/2 lb. The total direct materials purchases (assuming no beginning or ending inventory of material) of Materials A and B required for August production is Oa. $1,080,000 for A; $648,000 for B Ob. $1,125,000 for A; $675,000 for B Oc. $1,170,000 for A; $702,000 for B Od. $1,080,000 for A; $1,296,000 for B