Answer:
monopolist profile is $70
Explanation:
given data
profit-maximizing price = $12
output = 10 units
marginal cost = $6
average total cost = $5
to find out
what is monopolist profile
solution
we know that Profit is  express as
profit = Total Revenue - Total Cost    .................1
so here total revenue is
Total Revenue = Price Ă— Quantities
Total Revenue = 12 Ă— 10 = $120
and total cost is
Total Cost = Average cost Ă— Â Quantities
Total Cost = 5 Ă— 10 = $50
so here from equation 1
profit = $120 - $50
so monopolist profile is $70