I want accurate answers with proper explanation...

A buyer intends to buy lamps with a retail value of $8,000. He has already purchased 80 lamps at $35 each which will retail for $78 each. What markup should he obtain on the remaining lamps in order to achieve a 54% markup goal? O 49% O 54% O 50% O 98%A buyer for children's wear needs to purchase merchandise with a cost of $15,000. He has purchased children's sleepwear costing $3,000 which will retail for $5,200. If he is to achieve a 51.5% markup goal, what markup percent will be needed on the remainder of the goods? O 55.36% O 53.36% O 56.33% O 66%