How is the twenty percent (20%) markup calculated?

The twenty percent (20%) markup is calculated by multiplying the per bottle price of a particular bottle of wine by one and two tenths (1.2). The per bottle price is located on the latest wholesaler invoice. This is the minimum price that a store may advertise or sell a bottle of wine. Calculation Example: If the per bottle price of a wine on the wholesaler invoice is $10.00, the minimum price the retailer may advertise or sell the bottle of wine is $12.00 ($10.00 x 1.2 = $12.00).