Answer:
P = MR = 1
Explanation:
The demand function is q = 25 - 12p.
The total income is the price of potatoes multiplied by the quantities of potato --> P * Q
p*q = p*(25-12p)
p*q = 25p - 12p^2
the first derivative of the previous equation is the marginal revenue. In perfect competition the Price = Marginal revenue.
First derivative of total income ---> 25-24p
And MR = P
25-24p=p
25=25p