A rectangular box is to have a square base and a volume of 20 
. The material for the base costs 
, the material for the sides costs 
, and the material for the top costs 
. Letting x denote the length of one side of the base, find a function in the variable x giving the cost of constructing the box. 
Definitions:
Tax Rates
The percentage at which an individual or corporation is taxed, which can vary depending on income level, type of good or service, and other factors.
Laffer Curve
An economic theory suggesting there exists an optimal tax rate that maximizes government revenue without discouraging people from working or investing.
Tax Rate
The percentage at which an individual or corporation is taxed.
Tax Receipts
The revenue collected by the government through all forms of taxes, such as income tax, corporate tax, and sales tax.
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