On Sundays and holidays,the company must move 14 tons of mail,9 tons of medical supplies,and 11 tons of freight.This system of equations can be represented by the matrix: 
.Reduce this matrix to calculate how many aircraft of each type should be used.
Definitions:
Gross Investment
The total amount of money invested in capital assets before accounting for depreciation, representing all new investment in the economy.
Depreciation
The diminishing value of an asset over periods, often as a result of deterioration or becoming obsolete.
Inventory Investment
The purchase of goods and materials that are not currently needed for production but are held for future use, contributing to a company’s assets.
Inventory
The complete list of items such as property, goods in stock, or the contents of a building.
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