Question 1045728
For a special movie premiere, the theater owner decided to charge $20 per ticket for the first r rows of the theater and $15 for the remaining rows.
Explain how you could find the owner's total income if you knew the value of r and you knew that all of the tickets were sold.
:
The revenue for the r rows: 
Rev1 = 20r * $20
Rev1 = $400r
The revenue for the remaining rows
Rev2 = 20(40-r) * $15
Rev2 = (800 - 20r) * 15
Rev2 = 12000 - 300r
Total Rev = 12000 - 300r + 400r
total Rev = 12000 + 100r
Subtract the cost of the movie
Profit = 100r + 12000 - 275
Profit = 100r + 11725