A seller bought 120 flowers at $1000 from a farmer.
a). He sold 3 dozen of the flowers at $140 per dozen and the rest at $180 per dozen . Find the percentage profit. (這個我識，，answer is 68%
B) Suppose the seller changed his plan of sale. He sold the flowers with $8 profit each. After 40% of them were sold, the price of flowers were lowered. When all of them were sold, the total profit he could make was $708. Find the profit from selling each flower after 40% of them wee sold. (Answer is $4.5, 但我計不到）
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