Good morning dear tutor, i have a question needs to be answered. Thank in advance :)

Question No. 2 A firm sells its product in a perfectly competitive market where all firms charge a price of Rp 8.000 per unit. The firm's total costs are given as below (in Rupiah): C(O) = 5.000.000 + 2.000 0 + Q' a. Calculate how much output should the firm produce and how much profit can be received b. In the long-run, perfectly competitive firms produce a level of output such that MR=MC and P=MC. Why is this different from other market structures? c. In what sense the perfectly competitive market is an ideal market structure