Your On-Line Bookstore Is in Direct Competition with Amazon

Multiple Choice

Your on-line bookstore is in direct competition with Amazon.com, BN.com, and Borders.com. Your company s daily revenue in dollars is given by where x , y , and z are the online daily revenues of Amazon.com, BN.com, and Borders.com, respectively. If Amazon.com and BN.com each show a daily revenue of $9,000, give an equation showing how your daily revenue depends on that of Borders.com.

A) R ( z ) = 30,000 - 180 x - 90 y - 0.01 z + 0.0001 yz
B) R ( z ) = 30,000 - 0.01 z
C) R ( z ) = 29,730 + 0.89 z
D) R ( z ) = 30,000 - 0.01 z + 0.0001 z
E) R ( z ) = 29,730