Production and sales estimates for April are as follows: Estimated inventory (units), April 19,000 Desired inventory (units), April 30 18,000 Expected sales volume (units): Area 3,000 Area 4,750 Area 4,250 Unit sales price $20 The number of units expected to be manufactured in April isa. 9,500b. 13,000c. 11,000d. 12,000