Answer:
So unit elastic at q = 5
inelastic above 5
and elastic below 5
Explanation:
The elasticity is determianted by the marginal revenue.
Our first goal is to find the marginal revenue function
p = 40 - 4q
total revenue(TR) = quantity times price
q x (40 - 4q) = -4q^2 +40q
marginal revenue TR(q)/d(q) = -8q + 40
Now, with this fuction the economic analisys states that a demand is unit elastic when marginal revenue is zero.
It will be inelastic below zero and elastic above zero
MR will be zero when q = 5
-8(5) + 40 = 0
As quantity increases the demand will be inelastic
while
