Evaluate the double integral 
for the given function f(x, y) and the region R. 
; R is the rectangle defined by 
Definitions:
Machine-Hours
A measure of production output or activity based on the number of hours that machines are operated.
Average Costs
The total costs of production divided by the number of units produced, often used to assess cost efficiency.
Lease Cost
The expense associated with renting an asset, such as equipment or property, for a specified period.
Sales Volume
Sales volume refers to the total number of units of a product or service sold by a company during a specified period, often used to measure business activity level.
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