Suppose a small business has sales of $14,000 this month, with future sales expected to grow by $1,300 each month. costs consist of a fixed component, which is $8,400 per month, and a variable component, which is 25 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 8 months from now?