Answer:
(a) 160 Naira
(b) Undefined
Explanation:
Given
Let:
cost of bag of rice
people demanding the bag
So, we have:
---- The variation


We have:

When:


-- (1)
When:

--- (2)
Subtract (1) from (2)


Multiply through by 12



To solve for x, we have:
-- (1)
This gives:




So, the equation is:


Solving (1): y; when x = 225
We have:





Solving (2): x; when x = 200
We have:


Collect like terms


Cross multiply


x is undefined