∑
TestPrep
Magic
Features
Entrance Test
Puzzles
Videos
Practice
Download Free
Features
Entrance Test
Puzzles
Videos
Practice
Download Free
← Back to Test
Problem 13 - Entrance Test
A company sells x items at price (100 – x) dollars each. Which x maximizes revenue?
A. 40
B. 50
C. 60
D. 70
Check Answer
Show Solution
Correct: B
Revenue R = x(100 – x) = –x² + 100x. Vertex of parabola at x = –b/(2a) = 100/2 = 50.