A firm has a linear cost function. The firm's marginal cost of producing each unit of output is $4. When the firm produces 300 units, it has a total cost of $1,600. What is the firm's fixed cost? O $400 O $1.200 O $800 O $1,600 Question 9 A person deposits $400 in a savings account that earns 2.5% interest compounded annually How much is in the account one year later? S How much is in the account two years later? S How much is in the account ten years later? S Round to two decimal places 4 pts