Calculation of Wholesale Customers’ Share of Hetch Hetchy Enterprise Expenses. The Water Enterprise’s share of Hetch Hetchy Enterprise expenses consist of 100 percent of Water-Only expenses and the Water-Related portion (45%) of Joint expenses. The Wholesale Customers’ share of the sum of the Water Enterprise’s share of Hetch Hetchy Enterprise expenses determined under subsection B shall be calculated by multiplying that dollar amount by Adjusted Proportional Annual Use.