An Item Cost a Manufacturer $4 to Produce

An item cost a manufacturer $4 to produce. It has a wholesale trade discount of 66% and a retail trade discount of 50%. The list price of the item is $15. Assuming the retailer sold the item for $12, the dollar gross margins received by the manufacturer, wholesaler, and retailer are respectively: A)$5.90, $2.40, $4.50. B)$4.50, $1.10, $2.40. C)$1.10, $2.40, $4.50. D)$1.40, $2.50, $7.50. E)$2.64, $2.40, $6.96.