Production estimates for August are as follows:

Estimated inventory (units), August 112,000Desired inventory (units), August 319,000Expected sales volume (units), August75,000

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. $1,080,000 for A; $540,000 for B

b. $1,170,000 for A; $585,000 for B

c. $1,125,000 for A; $562,500 for B

d. $1,260,000 for A; $630,000 for B