Suppose a firm incurred explicit costs of $900 and implicit costs of $200 during a day. If that day the firm sold 8 units at $300 per unit its accounting profits are: $1,500 and its economic profits are:_______..a. $1,500 and its economic profits are $1,700.b. $1,300 and its economic profits are $1,300.c. $1,300 and its economic profits are $1,700. d. $1,500 and its economic profits are $1,300.