Economic question please helppppp meeee

Question

If a firm operates in a perfectly competitive market and the market price is £0.20 per unit, what is the efficient profit maximizing quanity that this firm should produce?

Answer 1

where the mc for the last unit is .20 per unit.  In other words, a perfectly competitive firm produces up to the point where P=MC.

Answer 2

profit maximizing out put is MC = MR and as in perfect competition P=MR=AR=D  so P=MC is also a profit maximizing condition

hence the output where MC of the firm is 0.20 will be the profit maximizing out put