When the Price of a Glass of Lemonade at a Lemonade

question 49

Multiple Choice

When the price of a glass of lemonade at a lemonade stand was $1.75, 400 glasses were sold. When the price was lowered to $1.50, 500 glasses were sold. Assume that the demand function is linear and that the marginal and fixed costs are $0.10 and $ 25, respectively. Find the marginal profit when 300 glasses of lemonade are sold and when 700 glasses of lemonade are sold.

• A) \(P ^ { \prime } ( 300 ) = 1.15 , P ^ { \prime } ( 700 ) = - 0.85\)
• B) \(P ^ { \prime } ( 300 ) = - 0.85 , P ^ { \prime } ( 700 ) = 1.15\)
• C) \(P ^ { \prime } ( 300 ) = 1.15 , P ^ { \prime } ( 700 ) = 0.85\)
• D) \(P ^ { \prime } ( 300 ) = 0.85 , P ^ { \prime } ( 700 ) = - 1.15\)
• E) \(P ^ { \prime } ( 300 ) = - 1.15 , P ^ { \prime } ( 700 ) = - 0.85\)

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