$14$

Identify whether each of the following is best described as a fixed, variable, or mixed cost with respect to product units.

$\backslash$table$[[1.$ Administrative assistant wages.,$],[2.$ Milk used in making ice cream.,$],[3.$ Electricity used in factory building.,$],[4.$ Cameras used in making smartphones.,$],[5.$ Real estate taxes.,$],[6.$ Insurance on factory building.,$],[7.$ Depreciation expense of warehouse.,$]]$