Suppose a small business has sales of $13,000 this month, with future sales expected to grow by $1,700 each month. Costs consist of a fixed component, which is $5,200 per month, and a variable component, which is 40 percent of sales. Design a spreadsheet to compute the gross profit (revenue less fixed and variable costs) per month over a nine month period. What is the gross profit in a single month 6 months from now?