Answer:
p = 2.7x - 20
p(90) = $223
Step-by-step explanation:
revenue → f(x) = 3x ,where x is the number of downloads.
the statement “Your profit p is $20 less than 90% of the revenue for x downloads”
means
[tex]p=90\% f\left( x\right) -20[/tex]
means
[tex]p=\frac{90}{100} \times f\left( x\right) -20[/tex]
means
[tex]p=\frac{9}{10} \times (3x) -20[/tex]
means
[tex]p=\frac{9}{10} \times (3x) -20[/tex]
means
[tex]p=2.7x -20[/tex]
………………………………
the profit for 90 downloads :
= p(90)
= 2.7×(90) - 20
= $223
