A trader realizes 10x - x\(^2\) naira profit from the sale of x bags on corn. How many bags will give him the desired profit?
A
4
B
5
C
6
D
7
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
y = 10x - x\(^2\)
dy/dx = 10 - 2x
As dy/dx = 0,
10 - 2x = 0
2x = 10
x = 5
Source: Myschool Past Questions Archive (Record #722)