Find the average value of 
over the region R, where R is a triangle with vertices 
.
Definitions:
Equity Method
An accounting technique used by a company to record its investment in another company when it has significant influence over that company but does not fully control it.
Investee's Net Income
The total profit of a company in which another company has an investment interest, after all expenses and taxes have been subtracted.
Original Cost
The initial amount of money spent to acquire an asset, including purchase price and all expenses incurred to bring it to its intended use.
Unrealized Gain
A profit that exists on paper as a result of an investment increasing in value but has not yet been sold for cash.
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