5 -- Invoice Table. Each customer receives 10 invoices each year for 10 years. Each invoice as 5 rows, one for each product. Each row has a primary key, customer key, product key, invoice key, and a price column. Each key/column is 20 bytes. This table exceeds double in size when going from [year 1] to [year 2]. This means for for 3 years the size formula would be