When an item is marked up by a certain percent and then marked down by the same percent, is the sale price equal to the price before the markup and markdown? Explain.

Step-by-step explanation:

For these, you calculate the markup or markdown in absolute terms (you find by how much the quantity changed), and then you calculate the percent change relative to the original value. So they're really just another form of "increase - decrease" exercises. A computer software retailer used a markup rate of 40%.

its a straight line parallel to the time axis