Based on the table below and the principle of diminishing returns to capital, then total packages wrapped when a fourth machine is installed must be less than ______ packages. 
Definitions:
Pseudostratified Columnar
A type of epithelial tissue with cells of varying heights that appear stratified but each cell touches the basal lamina.
Stratified Squamous
A type of epithelial tissue composed of several layers of flat cells designed to protect underlying tissues in areas subject to abrasion and friction.
Bronchi
The major air passages of the lungs that diverge from the windpipe.
Mesenchymal Cells
Stem cells that can differentiate into various types of cells including those of the bone, cartilage, muscle, and fat tissue.
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