Every step of DNA replication needs special molecules to do the work. These molecules are called enzymes. As we go through this, remember, all that is happening is the DNA is being unzipped and each side of the zipper is being copied.
Markup as a Percentage of Cost or Selling Price. Markup can be expressed as a percentage of cost or of selling price. Consider an item that costs the seller $50 and retails for $100.This is a 100-percent markup over cost, but in terms of the selling price it is only a 50-percent markup. Retailers typically express markup as a percentage of selling price.arkup as a Percentage of Cost or Selling Price. Markup can be expressed as a percentage of cost or of selling price. Consider an item that costs the seller $50 and retails for $100.
The easiest way to calculate markup is to use subtraction. For example, a retailer may purchase a phone with a suggested retail price of $30 US Dollars (USD). If the retailer paid $15 USD for the item, he can subtract his cost from the suggested retail price to come up with the markup amount.