Walnut has forecast sales for the next three months as follows: July 4,200 units, August 6,800 units, September 8,100 units. Walnut's policy is to have an ending inventory of 45% of the next month's sales needs on hand. July 1 inventory is projected to be 1,800 units. Selling and administrative costs are budgeted to be $24,000 per month plus $5 per unit sold. What are budgeted selling and administrative expenses for July?

a) $27,300

b) $45,300

c) $40,500

d) $45,000