The Demand Equation for a Certain Brand of Metal Alloy

question 40

Multiple Choice

The demand equation for a certain brand of metal alloy audiocassette tape is , where x represents the number (in thousands) of ten-packs demanded each week when the unit price is $p. How fast is the quantity demanded increasing when the unit price/ten-pack is $16 and the selling price is dropping at the rate of $.15/ten-pack/week? Round your answer to the nearest integer.
Hint: To find the value of x when p = 16, solve the equation for x when p = 16.

• A) Increasing at the rate of 44 ten packs/wk.
• B) Increasing at the rate of 71 ten packs/wk.
• C) Increasing at the rate of 60 ten packs/wk.
• D) Increasing at the rate of 69 ten packs/wk.

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