answer:Let’s see if I can figure this out… it’s kinda early… So, the buyer plans on selling 1500 vases at $40 each… $40×1500 = $60,000 And needs a markup of 48.5%, thus the cost of the goods would take up 51.5% of the overall cost…. $60000×0.515 = $30,900 And the person has already bought 1200 units at $23 each… $23×1200 = $27,600 So the remaining cost “allowed” would be… $30,900 – $27,600 = $3,300 And they need 300 more vases (1500 – 1200), thus…. $3,300 / 300 = $11!