By dividing the gross profit by the gross income, you derive this gross profit margin. As an example, if your business grossed $20,000 in income with $15,000 in sales expenses, subtracting $15,000 from $20,000 gives you a gross profit of $5,000.Dividing $5,000 by $20,000 calculates a 0.25 gross profit margin.y dividing the gross profit by the gross income, you derive this gross profit margin. As an example, if your business grossed $20,000 in income with $15,000 in sales expenses, subtracting $15,000 from $20,000 gives you a gross profit of $5,000. Dividing $5,000 by $20,000 calculates a 0.25 gross profit margin.
Typical costs: 1  Stone countertops, including granite, other natural stone and quartz resin (engineered stone) cost $4-$150 per square foot, or $120-$4,500 for a typical 30 square foot kitchen countertop. 2  Laminate countertops cost $7-$30 per square foot, or $210-$900 for a typical kitchen.
Granite is sold by the square foot, so it will be helpful to have this information when pricing the material at various dealers. The cost of a granite countertop will, of course, depend on the size of your surface area.However, the average granite countertop will cost approximately $50 to $100 per square foot. In addition to the size, the cost will also depend on how thick you want the slab to be.One way to reduce the cost of a granite countertop is by purchasing your choice through a wholesaler. These companies will often charge a customer less than a home improvement store for the cost of installation and materials.n addition to the size, the cost will also depend on how thick you want the slab to be. One way to reduce the cost of a granite countertop is by purchasing your choice through a wholesaler. These companies will often charge a customer less than a home improvement store for the cost of installation and materials.