The difference between the cost price and the retail price of merchandise. Markup may be expressed in dollars or as a percent. If stated as a percent, it may be based on either cost price or retail price. Most retailers base markup on retail price.
Measure the entire shape of a curved shower rod if this is the style you have. Expect the measured width to be approximately 6 inches more than a standard curtain rod. Purchase a shower curtain with a 72-inch width, if available, to compensate for the additional width. If necessary, a 70-inch curtain width works as well. This is because the rods curve inward at the edges, making for an overall smaller width measurement.
Buy a liner to match the size of your shower curtain. Coordinate with matching hardware. You will need a rod and rings to hang your shower curtain. Select something that matches the rest of your bathroom, and make sure the shower curtain hardware is durable and can hold the weight of the curtain and liner.