Please I need help with these questions. Please show calculation (work). Thank you!

QUESTIONS Problem 1 A firm in a perfectly competitive market is considering a product market, and estimates of its cost function are as shown below. If the market price of the product is currently $120, should the firm enter this market? How many units should the firm optimally produce and what would its total profit be? Problem 2 A small firm has the following on its balance sheet: If total long-term debt is $6,000 and total current liabilities are $14,000, what is the book value of equity? Problem 3 Consider the balance sheet from problem 2. If the market value of equity is $10,000, what is the firm's enterprise value, current ratio, and quick ratio? Problem 4 An asset you are considering buying has a 25% chance of paying you $5,000 in one year, a 60% chance of paying you $4,000 in one year, and a 15% chance of paying you nothing. If your required rate of return for this investment is 20%, what fair value do you place on this investment? Problem 5 Consider the investment in problem 4. What is the highest possible realized rate of return you could achieve if you are able to buy the asset for its fair value